A sample of oxygen gas has a volume of 3.24 L at 29°C. What volume will it occupy at 104°C if the pressure and number of mol are constant? Enter your answer in the provided box.

Answer:

The first solution has a final protein concentration of 0.0002 mg/ml.

To prepare the second solution, you have to take 56.25 ml of the stock solution 8 mg/ml and to add 43.75 ml of water.

Explanation:

For this kind of dilution problems is very useful the following equation:

Where Cc and Vc are the concentration and volume of the more concentrated solution respectively, whereas Cd and Vc are the concentration and volume of the diluted concentration. If you know three of these four parameters, you can calculate the missing parameter.

For the first solution, you have the volume (0.200 ml) and concentration (1 mg/ml) of the more concentrated solution, and the volume of the diluted soluted is implied (final volume= 0.2 ml + 0.8 ml= 1 ml). Then,

Cc x Vc=Cd x Vd

0.200 ml x 1 mg/ml= Cd x 1 ml

⇒ Cd= [tex]\frac{0.200 ml x 1mg/ml}{1 ml}[/tex] = 2 x 10⁻⁴ mg/ml= 0.0002 mg/ml

For the second solution, yo have the volume of the diluted solution (100 ml), the concentration of the diluted solution (4.5 mg/ml) and the concentration of the concentratesd solution (8 mg/ml). Then,

Cc x Vc= Cd x Vd

8 mg/ml x Vc= 100 ml x 4.5 mg/ml

⇒ Vc= [tex]\frac{100 ml x 4.5 mg/ml}{8 mg/ml}[/tex]= 56.25 ml

Thus, you have to take 56.25 ml of the more concentrated solution and to add the remaining volume of water to reach a final volume of 100 ml (100-56.25 ml= 43.75 ml)

Explanation:

An ionic bond is generally formed by a metal and a non-metal.

For example, lithium is an alkali metal with atomic number 3 and its electronic distribution is 2, 1.

And, chlorine is a non-metal with atomic number 17 and its electronic distribution is 2, 8, 7.

So, in order to complete their octet lithium needs to lose an electron and chlorine needs to gain an electron.

Hence, both of then on chemically combining together results in the formation of an ionic compound that is, lithium chloride (LiCl).

An ionic compound is formed by LiCl because lithium has donated its valence electron to the chlorine atom.  

For example, [tex]O_{2}[/tex] is a covalent compound as electrons are being shared by each oxygen atom.

Answer:

497.01 seconds will it take light to move a distance of [tex]1.49\times 10^8 km [/tex]from the Sun to the Earth.

Explanation:

Speed of the light = 299,792,458 m/s

Time taken by the light to cover [tex]1.49\times 10^8 [/tex] kilometer = T

[tex]1.49\times 10^8km=1.49\times 10^{11} m[/tex]

Speed=[tex]\frac{Distance}{Time}[/tex]

[tex] 299,792,458 m/s=\frac{1.49\times 10^{11} m}{T}[/tex]

[tex]T=497.01 seconds[/tex]

497.01 seconds will it take light to move a distance of [tex]1.49\times 10^8 km [/tex]from the Sun to the Earth.

To determine how long light takes to travel from the Sun to the Earth at a speed of 299,792,458 m/s for a distance of 1.49 x 10^8 km, convert the distance to meters and divide by the speed of light. The result is approximately 497 seconds.

If light moves at a speed of 299,792,458 m/s, and we want to determine how long it will take light to travel a distance of 1.49 x 108 km from the Sun to the Earth, we must first convert the distance to meters (since the speed of light is given in meters per second). To do this, we multiply by 1,000 (since 1 km = 1,000 m), yielding a distance of 1.49 x 1011 m.

To find the time in seconds, we divide the distance by the speed of light, which gives us:

Time (seconds) = Distance (m) / Speed of light (m/s) = 1.49 x 1011 m / 299,792,458 m/s

Performing the calculation yields approximately 497 seconds, which is the time it takes for light to travel from the Sun to the Earth with the given information. We use the same number of significant figures as presented in the distance measurement, which in this case is two (1.49).

Heating a carboxylic acid with a primary amine forms a secondary amide and water.

When heating a carboxylic acid with a primary amine, the organic product formed, along with water, is a secondary amide. This reaction is an example of amidation, where the carboxyl group (-COOH) of the acid reacts with the amine group (-NH2) from the primary amine, resulting in the formation of a secondary amide and a molecule of water as a by-product. The process is important in the formation of peptides and proteins, where similar reactions link amino acids together.

Answer:

The statement is true

Explanation:

Any physical quantity has a unique dimensional representation and when we change the dimensions of any physical quantity it looses it's original form. while as unit conversion is applicable to physical quantities of same nature as speed can be converted from kilometers per hour to miles per hour or meters per second, changing the units of any physical quantity into different unit's but of same dimensional formula only changes a magnitude of the physical quantity as in the above case the speed will be speed no matter whatever be the units.

since [tex]\frac{m^3}{sec}[/tex] are not the units of velocity but of volumetric rate of flow  we cannot convert this quantity into velocity by only unit conversion

Answer:

1.728 mol /(L*min)

Explanation:

Hello,

In the attached photo, you'll find the numerical procedure for your question.

- Take into account that the negative sign is eligible for reagents and positive for products.

Best regards!

Answer:

0.14 M

Explanation:

To determinate the concentration of a new solution, we can use the equation below:

C1xV1 = C2xV2

Where C is the concentration, and V the volume, 1 represents the initial solution, and 2 the final one. So, first, the initial concentration is 1.50 M, the initial volume is 55.0 mL and the final volume is 278 mL

1.50x55.0 = C2x278

C2 = 0.30 M

The portion of 139 mL will be the same concentration because it wasn't diluted or evaporated. The final volume will be the volume of the initial solution plus the volume of water added, V2 = 139 + 155 = 294 mL

Then,

0.30x139 = C2x294

C2 = 0.14 M

Answer:

The final concentration is 0.140 M

Explanation:

n₁=M₁.V₁ (First equation)

n₁=1.50 M

V₁=55 mL

M₂=n₂/V₂ (Second Equation)

V₂=278 mL

n₁=n₂

M₂=M₁.(V₁/V₂) (Third Equation)

n₃=M₃.V₃ (Forth Equation)

V₃=139 mL

M₃=M₂

n₃=M₁.(V₁/V₂).V₃ (Forth Equation)

M₄=n₄/V₄ (Fifth Equation)

n₄=n₃

M₄=M₁.(V₁/V₂).(V₃/V₄) (Sixth equation)

V₄=V₃+155 mL (Seventh Equation)

M₄=M₁.(V₁/V₂).(V₃/(V₃+155 mL))

M₄=1.50 M . (55mL / 278 mL) . ((139mL)/(139mL+155mL))

M₄=1.50 M . (55mL / 278 mL) . (139mL/294mL)

M₄=0.140 M

Answer:

2.77 mL of boiling water is the minimum amount which will dissolve 500 mg of phthalic acid.

Explanation:

We know from the problem that 18 g of phthalic acid are dissolved in 100 mL of water at 99 °C.

Now we devise the following reasoning:

If          18 g of phthalic acid are dissolved in 100 mL of water at 99 °C

Then   0.5 g of phthalic acid are dissolved in X mL of water at 99 °C

X = (0.5 × 100) / 18 = 2.77 mL of water

Final answer:

To dissolve 500 mg of phthalic acid, a student could use a minimum of approximately 2.78 mL of boiling water, considering the solubility of 18 g per 100 mL at 99 ℃.

Explanation:

The question asks for the smallest volume of boiling water (at 99 ℃) needed to dissolve 500 mg of phthalic acid, with the solubility of phthalic acid provided as 0.54 g at 14 ℃ and 18 g at 99 ℃. To find this volume, we start by converting the mass of phthalic acid to be dissolved (500 mg or 0.5 g) to grams because the solubility is given in grams. Knowing the solubility of phthalic acid at 99 ℃ is 18 g per 100 mL, we calculate the volume required for 0.5 g as follows:

Solubility equation: (Volume of water) x (Solubility of compound in g/100mL) = Mass of compound to be dissolved

Thus, (Volume of water) x (18 g/100 mL) = 0.5 g

Rearranging for Volume of water gives: Volume of water = (0.5 g) / (18 g/100 mL) = 2.78 mL

Therefore, the student could use a minimum of approximately 2.78 mL of boiling water to dissolve 500 mg of phthalic acid.

Explanation:

When the water droplets are placed in oily surface, oil being non-polar, thus there will not be adhesive force between water and oil.

Thus, surface tension is the factor which is responsible for shape of the water droplets to be spherical. The water molecules are pulled into the spherical shape by the action of the cohesive forces which is acting on the surface layer. As, the medium is totally different outside, the water molecules tend to get the minimum area and thus, forming spherical droplets.

Answer : The moles of Ne gas are 46.25 moles.

Explanation :

using ideal gas equation

[tex]PV=nRT[/tex]

where,

P = pressure of gas = 45 atm

V = volume of gas = 24.3 L

T = temperature of gas = [tex]15.0^oC=273+15.0=288K[/tex]

R = gas constant = 0.0821 L.atm/mole.K

n = moles of gas = ?

Now put all the given values in the ideal gas equation, we get:

[tex](45atm)\times (24.3L)=n\times (0.0821L.atm/mole.K)\times (288K)[/tex]

[tex]n=46.25mole[/tex]

Therefore, the moles of Ne gas are 46.25 moles.

Answer:

To maintain a pH value of 8.8 in a particular solution the best option is Tris or boric acid.

Explanation:

To decide a good acid/conjugate base pair it is necessary to know the pKa of the acids because every buffer has an optimal effective range due to pH = pKa ± 1. The closer the working pH is to the acid pKa, the buffer will be more effective. Below is the list of the pKa of the different option.

Acetic acid: pKa = 4.76

Boric acid: pKa1 = 9.24 pKa2 = 12.74 pKa3 = 13.80

Ascorbic acid: pKa1 = 4.17 pKa2 = 11.57

Tris:  pKa = 8.06

Acetic and Ascorbic acid are too far from the range of 8.8. Thus the best options are boric acid or Tris. To define between these two it is necessary to consider other factors like interaction between components of the solution and the ionic strength required.

Answer:

[tex]CaCl_2[/tex]

Explanation:

Calcium is the element of the group 2 and period 4 which means that the valence electronic configuration is [tex][Ar]4s^2[/tex].

Chlorine is the element of the group 17 and period 3 which means that the valence electronic configuration is [tex][Ne]3s^23p^5[/tex].

Thus, calcium losses 2 electrons to 2 atoms of chlorine and these 2 atoms of chlorine accepts each electron to form ionic bond. This is done in order that the octet of the atoms are complete and they become stable.

Ca         Cl

2            1

Cross multiplying the valency, We get, [tex]CaCl_2[/tex]

Thus, the formula of calcium chloride is [tex]CaCl_2[/tex].

Calcium Chloride, with the formula CaCl2, is composed of one calcium (Ca2+) ion and two chloride (Cl-) ions to ensure electrical neutrality.

The compound Calcium Chloride is formed by the elements calcium (Ca) and Chloride (Cl). From the periodic table, we can see that calcium (Ca) forms +2 ions and Chloride (Cl) forms -1 ions. As compounds must be electrically neutral, the formula of an ionic compound represents the simplest ratio of the numbers of ions necessary to balance out the charges. Thus, for every calcium ion, we need two chloride ions to balance out the charges. So the formula for this compound is CaCl2.

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Answer:

D. the forward reaction will have a lower activation energy than the reverse reaction.

Explanation:

An exothermic reaction is one which is accompanied by the release of heat energy. In this case the products have a lower energy than that of the reactants.

Activation energy is the minimum amount of energy required to initial or start a chemical reaction. In exothermic reactions, the reactants are at a higher energy (relative to the products) to begin with. Hence, they would require a lower activation energy to overcome the energy barrier in order to form the products.

The correct option is D. the forward reaction will have a lower activation energy than the reverse reaction.

In an exothermic reaction, energy is released as the reaction proceeds from reactants to products. This means that the products are at a lower energy state than the reactants. The activation energy for a reaction is the minimum amount of energy that the reactants must possess for the reaction to occur. Since energy is released during the reaction, the energy level of the products is lower than that of the reactants, and consequently, the activation energy for the reverse reaction (products going back to reactants) is higher than that for the forward reaction.

 Let's analyze each option:

A. The forward reaction is slower than the reverse reaction - This statement is not necessarily true for exothermic reactions. The rate of a reaction is determined by the activation energy and the concentration of reactants, among other factors.

 B. The reaction rate will speed up with time - This statement is not generally true. The rate of a reaction can change with time depending on various factors such as the concentration of reactants, temperature, and the presence of catalysts. However, for a simple exothermic reaction, the rate may slow down over time as the concentration of reactants decreases.

 C. The collision energy of the reactants will be greater than that of the products - This statement is true for an exothermic reaction because the reactants have more energy than the products, and the excess energy is released during the reaction.

 D. The forward reaction will have a lower activation energy than the reverse reaction - This statement is correct for an exothermic reaction. The products are at a lower energy state than the reactants, so the energy barrier for the reverse reaction is higher.

 E. The activation energy will change as the reaction progresses - This statement is not accurate in a simple sense. The activation energy is a characteristic of the reaction itself and does not change as the reaction progresses. However, the presence of intermediates or changes in reaction conditions can affect the observed activation energy.

Therefore, the correct answer is D, as it accurately describes the relationship between activation energies in an exothermic reaction.

Answer:

Molecular weight of the compound = 372.13 g/mol

Explanation:

Depression in freezing point is related with molality of the solution as:

[tex]\Delta T_f = K_f \times m[/tex]

Where,

[tex]\Delta T_f[/tex] = Depression in freezing point

[tex]K_f[/tex] = Molal depression constant

m = Molality

[tex]\Delta T_f = K_f \times m[/tex]

[tex]1.33 = 5.12 \times m[/tex]

m = 0.26

Molality = [tex]\frac{Moles\ of\ solute}{Mass\ of\ solvent\ in\ kg}[/tex]

Mass of solvent (toluene) = 15.0 g = 0.015 kg

[tex]0.26 = \frac{Mole\ of\ compound}{0.015}[/tex]

Moles of compound = 0.015 × 0.26 = 0.00389 mol

[tex]Mol = \frac{Mass\ in\ g}{Molecular\ weight}[/tex]

Mass of the compound = 1.450 g

[tex]Molecular\ weight = \frac{Mass\ in\ g}{Moles}[/tex]

Molecular weight = [tex]\frac{1.450}{0.00389} = 372.13\ g/mol[/tex]

Answer:  The reaction order with respect to A is m

Explanation:

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reaction:

[tex]aA+bB\rightleftharpoons cC+dD[/tex]  

[tex]Rate=k[A]^m[B]^n[/tex]

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction.

Hence, this is not considered as an elementary reaction.

Order with respect to A = m

Order with respect to B = n

Overall order = m+n

Thus order with respect to A is m.

In a rate law equation, the reaction order with respect to a reactant, for instance, A, is represented by the corresponding exponent in that equation. It defines how the rate of the chemical reaction alters with the concentration change of that reactant.

In a rate law equation, the reaction order with respect to a certain reactant, say, A, is represented by the exponent 'm' in the equation rate=k[A]m[B]n. This shows how the rate of the chemical reaction changes with the change in concentration of the reactant A. The higher 'm' is, the more sensitive the reaction rate is to the concentration of reactant A. It could be zero, indicating that the reaction rate is independent of the concentration of A; one, indicating a first-order dependence, and so on.

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Answer:

Covalent bonds

Explanation:

Covalent bonds

These types of chemical bonds are between the atoms of same or comparable electronegtivity .

The formation of bond is to attain stability of the compound formed .

Hence , octet rule plays a major rule .

For example ,

The bond between the atoms of H₂ is a covalent bond , since , one atom of H have only 1 electron in its valence shell .

So it shares its one electron with another Hydrogen atom to attain stability , and forms a covalent bond .

Answer:

[tex](\rho*Q)/(\mu*h)[/tex]

Explanation:

First, we need to establish the unit of each variable:  

To eliminate [tex]m^3[/tex] we need to multiply Q by [tex]\rho[/tex]. Then to eliminate kg we divide [tex]\rho[/tex] by [tex]\mu[/tex]. Finally, multiply [tex]\mu[/tex] by h we can let the constant dimensionless.

Answer:

a) D = 33.44 Lbmol/h

⇒ B = 62.56 Lbmol/h

b) D = 16.848 Kmol/h

⇒ B = 28.152 Kmol/h

Explanation:

global balance:

∴ F = 100 Lbmol/h

balance per component:

A: 0.4*F = 0.9*D + 0.1*B = 0.4*100 = 40 Lbmol/h..............(2)

B: 0.6*F = 0.1*D + 0.9*B = 0.6*100 = 60 Lbmol/h..............(3)

from (2):

⇒ 0.9*D = 40 - 0.1*B

⇒ D = ( 40 - 0.1*B ) / 0.9............(4)

(4) in (3):

⇒ 0.1*((40-0.1*B)/0.9) + 0.9*B = 60

⇒ B = 62.56 Lbmol/h............(5)

(5) in (1):

⇒ D = 100 - B

⇒ D = 37.44 Lbmol/h

∴ Lbmol = 0.45 Kmol

⇒ B = 62.56 Lbmol/h * ( 0.45 Kmol/ Lbmol ) = 28.152 Kmol/h

⇒ D = 37.44 Lbmol/h * ( 0.45 Kmol/h ) = 16.848 Kmol/h

Answer: The number of moles of ammonium nitrate is 0.004 moles.

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}[/tex]

We are given:

Molarity of [tex]NH_4NO_3[/tex] solution = 0.125 M

Volume of solution = 32.5 mL

Putting values in above equation, we get:

[tex]0.125M=\frac{\text{Moles of }NH_4NO_3\times 1000}{32.5mL}\\\\\text{Moles of }NH_4NO_3=0.004mol[/tex]

Hence, the number of moles of ammonium nitrate is 0.004 moles.

Answer:

hhh

Explanation:

Pyranose is collective term for the saccharides which have chemical structure which includes six-membered ring that consists of one oxygen atom and five carbon atoms.

Furanose is collective term for carbohydrates which have chemical structure which includes five-membered ring system that consists of one oxygen atom and four carbon atoms.

Glucose exists both in pyranose and furanose form. It's structure is shown in image.

Answer:

Spring constant: [tex]\rm 447\; N \cdot m^{-1}[/tex].

Work done: [tex]\rm 0.0438\; J[/tex].

Explanation:

Convert all values to SI units.

Assume that the spring-mass system is vertical and is placed on the surface of the earth. The gravitational acceleration constant will be equal to [tex]\rm 9.81\; N\cdot kg^{-1}[/tex].

Gravitational pull on the weight:

[tex]W = m\cdot g = \rm 0.638\; kg \times 9.81\; N\cdot kg^{-1} = 6.25878\; N[/tex].

That's also the size of the force on the spring. [tex]F = \rm 6.25878\; N[/tex].

The spring constant is the size of the force required to deshape the spring (by stretching, in this case) by unit length.

[tex]\displaystyle k_{\text{spring}} = \frac{F}{\Delta x} = \rm \frac{6.25878\; N}{0.014\; m} = 447.056\; N\cdot m^{-1}[/tex].

Assume that there's no energy loss in this process. The work done on the spring is the same as the elastic potential energy that it gains:

[tex]\begin{aligned} &\text{EPE} \\=& \frac{1}{2}k\cdot x^{2} \\=&\rm \frac{1}{2} \times 447.056\; N\cdot m^{-1} \times (0.014\; m)^{2}\\ =& \rm 0.0438\; J\end{aligned}[/tex].

Answer:

[tex]Q=\frac {[Fe^{2+}]^2[Zn^{2+}]}{[Fe^{3+}]^2}[/tex]

Explanation:

The reaction quotient of an equilibrium reaction measures relative amounts of the products and the reactants present during the course of the reaction at  particular point in the time.

It is the ratio of the concentration of the products and the reactants each raised to their stoichiometric coefficients. The conecntration of the liquid and the gaseous species does not change and thus is not written in the expression.

Thus, for the reaction:

[tex]2Fe^{3+}_{(aq)}+Zn_{(s)}\rightleftharpoons 2Fe^{2+}_{(aq)}+Zn^{2+}_{(aq)}[/tex]

The expression is:

[tex]Q=\frac {[Fe^{2+}]^2[Zn^{2+}]}{[Fe^{3+}]^2}[/tex]

Answer:

A solvent is a chemical substance that has the ability to dissolve other chemical compounds, called solute, to form a solution.                

Solvents can be polar and non-polar in nature.

In general, polar solvents dissolve only polar solute molecules and non-polar solvents dissolve only non-polar solute molecules.

Highly polar solute molecule such as ionic compounds like NaCl and sugars, dissolve only in highly polar solvents with a large dielectric constant like water.

Therefore, because of the high dielectric constant of water, ionic compounds can be easily separated and dispersed.

Answer:

Risk management

Explanation:

Risk communication is exchange of the advice, real-time information and the opinions between the experts and the people which are facing threats to their economic, health, or well-being.

Risk assessment is overall process where the hazards and the risk factors which have potential to cause the harm is identified.

Risk perception is subjective judgement which people/ experts make about characteristics and the severity of the risk.

Risk management is evaluation, identification and prioritization of the risks followed by the coordinated and the economical application of the resources to monitor, minimize and control probability of the unfortunate events.

Thus, Option D is correct because in risk management, a Quantitative Solution is given to decrease risk level like to recycle the plastic.

Answer:

Risk management.

Explanation:

Hello

In this case, it is convenient for us to define the four types of risks regarding to manufacturing processes as follows:

- Risk communication is an interactive process in which the just the exchange of information and opinion about a particular risk among risk specialists and other interested organisms. This is not the answer as it implies a requirement not the aforesaid exchange of information.

- Risk assessment useful to describe the widespread procedure to identify hazards and risk factors and their consequences and to both analyze and evaluate the risk regarding to such hazard. This is not the answer as a requirement is not procedure indeed.

- Risk perception involves how one both thinks and feels about the faced risks. This is not the answer as a requirement is not something coming from a thought or feeling.

- Risk management accounts for the identification, evaluation, and prioritization of risks followed by a coordinated and economical application of resources to minimize, monitor, and control the probability or impact of harmful facts or to maximize the realization of opportunities. This is the answer as a requirement is eligible for the identification and a subsequent application of a resource as the industries must recycle the specified amount via varied industrial processes (recirculation, storage and others).

Best regards.

Answer:

[CH₃COO⁻]  [H⁺] pH

0,1 M  0,0025 M  6,30

0,1 M  0,005 M  6,02

0,1 M  0,01 M  5,70

0,1 M  0,05 M  4,74

0,01 M  0,0025 M  5,22

0,01 M  0,005 M  4,75

0,01 M  0,01 M  3,38

0,01 M  0,05 M  1,40

Explanation:

The equilibrium of sodium acetate is:

CH₃COOH ⇄ CH₃COO⁻ + H⁺ Kₐ = 1,8x10⁻⁵

Where [CH₃COO⁻] are 0,1 M and 0,01 M and [H⁺] are 0,0025 M 0,005 M 0,01 M and 0,05 M.

For  [CH₃COO⁻]=0,1 M and [H⁺]=0,0025M the concentrations in equilibrium are:

[CH₃COO⁻] = 0,1 M - x

[H⁺] = 0,0025 M - x

[CH₃COOH] = x

The expression for this equilibrium is:

Ka = [tex]\frac{[CH3COO^-] [H^+] }{[CH3COOH]}[/tex]

Replacing:

1,8x10⁻⁵ = [tex]\frac{[0,1-x] [0,0025-x] }{[x]}[/tex]

Thus:

0 = x²-0,102518x +2,5x10⁻⁴

Solving:

x = 0,100 ⇒ No physical sense

x = 0,0024995

Thus, [H⁺] = 0,0025-0,0024995 = 5x10⁻⁷

pH = - log [H⁺] = 6,30

Following the same procedure changing both  [CH₃COO⁻] and [H⁺] initial concentrations the obtained pH's are:

[CH₃COO⁻]  [H⁺] pH

0,1 M  0,0025 M  6,30

0,1 M  0,005 M  6,02

0,1 M  0,01 M  5,70

0,1 M  0,05 M  4,74

0,01 M  0,0025 M  5,22

0,01 M  0,005 M  4,75

0,01 M  0,01 M  3,38

0,01 M  0,05 M  1,40

I hope it helps!

The pH values for the [tex]0.1 \ M[/tex] sodium acetate solution when [tex]0.0025 \ M[/tex], [tex]0.005\ M, 0.01\ M,[/tex] and [tex]0.05\ M[/tex] [tex]HCl[/tex] are added are approximately [tex]6.35, 6.03, 5.70,[/tex] and [tex]4.75[/tex] respectively. For the 0.01 \ M sodium acetate solution, the pH values are approximately [tex]5.23, 4.75, 2,[/tex] and [tex]1.30[/tex] respectively.

The Henderson-Hasselbalch equation is given by:

[tex]\[ \text{pH} = \text{pKa} + \log \left( \frac{[\text{base}]}{[\text{acid}]} \right) \][/tex]

For acetic acid ([tex]CH_3COOH[/tex]) and its conjugate base acetate ([tex]CH_3COO^-[/tex]), the [tex]pKa[/tex] is approximately [tex]4.75[/tex] at [tex]25^\circ C[/tex]

Let's calculate the pH for each case:

1. For the [tex]0.1 \ M[/tex] sodium acetate solution:

a. When [tex]0.0025 \ M \ HCl[/tex] is added:

The concentration of acetate ions remains [tex]0.1 \ M[/tex], while the concentration of acetic acid formed by the reaction of [tex]HCl[/tex] with acetate ions is [tex]0.0025 \ M[/tex]

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.1}{0.0025} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (40) \][/tex]

[tex]\[ \text{pH} = 4.75 + 1.60 \][/tex]

[tex]\[ \text{pH} = 6.35 \][/tex]

b. When [tex]0.005\ M \ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0.095 \ M[/tex], and the concentration of acetic acid is [tex]0.005\ M[/tex]

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.095}{0.005} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (19) \][/tex]

[tex]\[ \text{pH} = 4.75 + 1.28 \][/tex]

[tex]\[ \text{pH} = 6.03 \][/tex]

c. When [tex]0.01 \ M \ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0.09 \ M[/tex], and the concentration of acetic acid is[tex]0.01\ M[/tex]

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.09}{0.01} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (9) \][/tex]

[tex]\[ \text{pH} = 4.75 + 0.95 \][/tex]

[tex]\[ \text{pH} = 5.70 \][/tex]

d. When [tex]0.05 \ M \ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0.05 \ M[/tex], and the concentration of acetic acid is [tex]0.05 \ M[/tex]

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.05}{0.05} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (1) \][/tex]

[tex]\[ \text{pH} = 4.75 \][/tex]

2. For the [tex]0.01 \ M[/tex] sodium acetate solution:

a. When [tex]0.0025\ M \ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0.0075 \ M[/tex], and the concentration of acetic acid is [tex]0.0025 \ M[/tex].

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.0075}{0.0025} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (3) \][/tex]

[tex]\[ \text{pH} = 4.75 + 0.48 \][/tex]

[tex]\[ \text{pH} = 5.23 \][/tex]

b. When [tex]0.005 \ M \ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0.005 \ M[/tex], and the concentration of acetic acid is[tex]0.005 \ M[/tex]

[tex]\[ \text{pH} = 4.75 + \log \left( \frac{0.005}{0.005} \right) \][/tex]

[tex]\[ \text{pH} = 4.75 + \log (1) \][/tex]

[tex]\[ \text{pH} = 4.75 \][/tex]

c. When [tex]0.01 \ M\ HCl[/tex] is added:

The concentration of acetate ions is now [tex]0 M[/tex] (fully reacted), and the concentration of acetic acid is [tex]0.01 \ M[/tex]. The solution is no longer buffered, and the pH is that of a [tex]0.01 \ M[/tex] acetic acid solution.

[tex]\[ \text{pH} = -\log (0.01) \][/tex]

[tex]\[ \text{pH} = 2 \][/tex]

d. When [tex]0.05 \ M \ HCl[/tex] is added:

The solution is overwhelmed by the strong acid, and the pH is determined by the excess [tex]HCl[/tex]. The pH is approximately that of a [tex]0.05 M HCl[/tex] solution.

[tex]\[ \text{pH} = -\log (0.05) \][/tex]

[tex]\[ \text{pH} = 1.30 \][/tex]

Answer:

True

Explanation:

*For polar and associated substances, methods based on four should be used  four or more parameters, like analytical equation of state

*The term "analytical equation of state" implies that the function

It contains powers of v not greater than four.

*Most expressions are of the cubic type and are grouped into

the so-called cubic equations of state.

*Cubic EoS calls are very popular in simulation of

processes due to its robustness and its simple extension to mixtures.

*They are based on the van der Waals state equation of more than

100 years.

Answer:

86.71 g of glyoxylic acid monohydrate, and 348.56 g of sodium glyoxylate monohydrate.

Explanation:

In order to solve this problem we need to use the Henderson–Hasselbalch equation:

pH= pka + [tex]log\frac{[A^{-} ]}{[HA]}[/tex]

In this case [A⁻] is the concentration of sodium glyoxylate, and [HA] is the concentration of glyoxylic acid.

Using the Henderson–Hasselbalch (H-H) equation, the given pH and pka we can determine a relationship between [A⁻] and [HA]:

3.85 = 3.34 +  [tex]log\frac[{A^{-}] }{[HA]}[/tex]

0.51 = [tex]log\frac{[A^{-} ]}{[HA]}[/tex]

[tex]10^{0.51} =\frac{[A^{-}] }{[HA]} \\3.24=\frac{[A^{-} ]}{[HA]}[/tex]

Also from the problem, we know that

[A⁻] + [HA] = 1.60 M

We rearrange that equation to

[A⁻] = 1.60 M - [HA]

And replace the value of  [A⁻] in the H-H equation and solve for [HA]:

[tex]3.24=\frac{1.60M-[HA]}{[HA]}\\3.24*[HA]=1.60-[HA]\\4.24*[HA]=1.60\\0.377 M = [HA][/tex]

We substract 0.377 M to 1.60 M in order to calculate [A⁻].

1.60 M - 0.377 M= 1.223 M = [A⁻]

Lastly we calculate the mass of each reagent, using the concentration, volume and molecular weights:

2.50 L * 0.377 M * 92 g/mol = 86.71 g glyoxylic acid monohydrate.

2.50 L * 1.223 M * 114 g/mol = 348.56 g sodium glyoxylate monohydrate.

Why does the problem ask that we use the monohydrate forms? Because that's the available reagent in the laboratory.

To prepare a 1.60 M buffer at pH 3.85 using glyoxylic acid and sodium glyoxylate, you will need 60.95 g of glyoxylic acid and 296.93 g of sodium glyoxylate.

To calculate the grams of glyoxylic acid and sodium glyoxylate needed to prepare a 1.60 M buffer at pH 3.85, we first need to determine the mole ratios of the components in the buffer. The Henderson-Hasselbalch equation can be used to calculate these ratios:

pH = pKa + log([A-]/[HA])

In this case, the pKa of glyoxylic acid is given as 3.34. We can rearrange the equation to solve for the ratio of [A-]/[HA]:

log([A-]/[HA]) = pH - pKa = 3.85 - 3.34 = 0.51

10^0.51 = [A-]/[HA]

[A-]/[HA] = 3.295

Since we know the total volume of the buffer is 2.50 L and the molar concentration is 1.60 M, we can use the mole ratio to calculate the moles of glyoxylic acid and sodium glyoxylate needed:

[HA] = (1.60 M) / (1 + 3.295) = 0.327 M

[A-] = 3.295 * [HA] = 3.295 * 0.327 M = 1.076 M

Now we can use the molar masses of glyoxylic acid and sodium glyoxylate to calculate the mass needed:

Mass of glyoxylic acid = (0.327 M) * (2.50 L) * (74.04 g/mol) =  60.95 g

Mass of sodium glyoxylate = (1.076 M) * (2.50 L) * (110.07 g/mol) =  296.93 g

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Answer:

a) Schmidt number

Explanation:

Prandtl number in heat transfer is analogues to Schmidt number in mass transfer.

Prandtl number in heat transfer is the ration of momentum diffusivity to the heat diffusivity.

[tex]P_r = \frac{\nu}{\alpha}[/tex]

Whereas, Schmidt number in mass transfer is the ratio of momentum diffusivity to the mass diffusivity.

[tex]S_c= \frac{\nu}{\nu_{AB}}[/tex]

Answer:

2 molecular ions are produced and they are charged negatively

Explanation:

If an ion loses an electron then its charge is +1, if it gains an electron then its charge is -1

3 molecular ions lost 2 electrons each, each ion is charged +2

Total charge = 3(+2) = +6

2 molecular ions gained 3 electrons each, each ion is charged -3

Total charge = 2(-3) = -6

1 molarcular ion gained 2 electrons, ion is charged -2

Net charge of the reactants is:

+6 -6 -2 = -2

The net charge of the reactants must be the same as the net charge of the products.

In the products you have 2 neutral molecules (with charge 0) and molecular ions with a charge of magnitude e.

Since the net charge in the reactants is negative, the net charge in the products is also negative

If the number of molecular ions in the products is x then its total charge is:

x*(-1) = -2

x = 2

Answer: The given number in scientific notation is [tex]1.044\times 10^{-7}[/tex]

Explanation:

Scientific notation is the notation where a number is expressed in the decimal form. This means that the number is always written in the power of 10 form. The numerical digit lies between 0.1.... to 9.9.....

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

We are given:

A number having value = 0.00000010445

Converting this into scientific notation, we get:

As, the decimal is shifting to right side, the power of 10 will be negative.

[tex]\Rightarrow 0.00000010445=1.044\times 10^{-7}[/tex]

Hence, the given number in scientific notation is [tex]1.044\times 10^{-7}[/tex]