A reaction between substances Y and Z is
representedstochiometrically by
Y2 + Z2 ---> 2YZ


The rate constant obeys the Arrhenius equation. At 435.
K
the rate constant is k = 2.95 e-03 L/mol-s and A = 3.00 e+10
L/mol-s
What is the activation energy (KJ/mol) for
thisreaction?

Explanation:

Ion-ion forces are defined as the forces that exist between oppositely charged ions.

Dipole-dipole interactions are defined as the forces which exist between positive end of polar molecule and negative end of another polar molecule.

Ion-dipole forces are defined as the forces that exist between a charged ion and a polar molecule.

London dispersion forces are defined as the forces that arise due to the development of temporary charges on the combining atoms of a molecule.

Hence, the given substances are classified as follows.

(a) HF - It is a covalent compound but due to the difference in electronegativity of hydrogen and fluorine there will be development of partial charges on both of them.

Hence, in a HF molecule there will be dipole-dipole forces.

(b) [tex]CH_{3}OH[/tex] - There will also be development of partial charges due to the difference in electronegativity of oxygen and hydrogen atoms.

Hence, in a [tex]CH_{3}OH[/tex] there will be dipole-dipole forces.

(c) [tex]CaCl_{2}[/tex] - It is an ionic compound. Hence, there will be partial positive charge on calcium and partial negative charge on chlorine atom.

Hence, in a [tex]CaCl_{2}[/tex] molecule there will exist ion-ion forces.

(d) [tex]FeBr_{3}[/tex] - It is an ionic compound. Hence, there will also exist ion-ion forces.

Answer:

a) (2)

b) (2)

c) (3)

d) (3)

Explanation:

The intermolecular forces are the forces that make molecules to be bond in a substance. When a solvent dissolves a solute, the molecules of the solvent and the solute will be attached by the forces. The types of forces are:

The bonds between substances can mix these forces. So if one is polar and the other is nonpolar, the bond will be London dipole; if both are polar, dipole dipole, if one is polar and the other is ionic ion dipole; and if one is nonpolar and the other is ionic, ion London.

Water (H2O) is a polar molecule, so the dipole must happen in all of the dissolutions.

a) HF is a polar molecule, so the bond of it and water will be dipole dipole. In both substances the hydrogen is bonded to high electronegativity elements, so its hydrogen bond! But, because there's no answer to it, we can call it dipole dipole. (2)

b) CH3OH is a polar compound, and have hydrogen bonds, but, as explained above, it'll be dipole dipole forces. (2)

c) CaCl2 is an ionic compound (cation Ca+2 and anion Cl-), thus the force will be ion dipole. (3)

d) FeBr3 is an ionic compound (cation Fe+3 and anion Br-), thus the force will be ion dipole. (3)

Answer:

Explanation:

Hello,

At first, consider the balanced reaction for the combustion of the isooctane:

[tex]C_8H_{18}+\frac{25}{2} O_2-->8CO_2+9H_2O[/tex]

Now, the stoichiometric relationship between the hydrocarbon and the oxygen leads to:

[tex]molO_2=230molC_8H_{18}(\frac{\frac{25}{2}mol O_2 }{1mol C_8H_{18}} )=2875molO_2[/tex]

Best regards.

Answer:

6,45mmol/L of NaOH you need to add to reach this pH.

Explanation:

CH₃COOH ⇄ CH₃COO⁻ + H⁺ pka = 4,74

Henderson-Hasselbalch equation for acetate buffer is:

5,0 = 4,74 + log₁₀[tex]\frac{[CH_{3}COO^-]}{[CH_{3}COOH]}[/tex]

Solving:

1,82 = [tex]\frac{[CH_{3}COO^-]}{[CH_{3}COOH]}[/tex] (1)

As total concentration of acetate buffer is:

10 mM = [CH₃COOH] + [CH₃COO⁻] (2)

Replacing (2) in (1)

[CH₃COOH] = 3,55 mM

And

[CH₃COO⁻] = 6,45 mM

Knowing that:

CH₃COOH + NaOH → CH₃COO⁻ + Na⁺ + H₂O

Having in the first 10mmol/L of CH₃COOH, you need to add 6,45 mmol/L of NaOH. to obtain in the last 6,45mmol/L of CH₃COO⁻ and 3,55mmol/L of CH₃COOH .

I hope it helps!

Answer:

84.6 mL

Explanation:

To get the total volume of soultion we must add the given volumes together.

4.21 mL + 80.4 mL = 84.6 mL

Answer:

Without doing any calculations it is possible to determine that silver chromate is more soluble than C,D , and silver chromate is less soluble than none .

It is not possible to determine whether silver chromate is more or less soluble than A,B by simply comparing Kspvalues

Explanation:

For this kind of question you need to obtain the balanced equation for the solubility, first, you will write the dissociation equation for every molecule, obtaining the ions in which it dissociates. Then you substitute in the Kps equation

[tex]A_{n}B_{m} -> nA^{m+}+mB^{n-} \\K_{s}=[A^{m}]^{n}[B^{n}]^{m}[/tex]

Considering the corresponding stoichiometry you'll substitute in your dissociation equations as follow.

[tex]Ag_{2}CrO_{4}(s)->2Ag^{+}(aq)+CrO_{4} ^{2-}\\        s  ->2s+s\\s->[2s]^{2}[s]=4s^{3}  \\\\A)  PbF_{2}(s)->Pb^{2+} (aq)+2F^{-}\\s->s+2s\\s->[s][2s]^{2}=4s^{3}\\\\\\B)Ag_{2}SO_{3}(s)->2Ag^{+}(aq)+SO_{3} ^{2-}\\        s  ->2s+s\\s->[2s]^{2}[s]=4s^{3}  \\\\\\C)NiCO_{3}(s)->Ni^{2+}(aq)+CO_{3} ^{2-}\\        s  ->s+s\\s->[s][s]=s^{2}  \\\\\\D)AgCl(s)->Ag^{+}(aq)+Cl^{-}(aq)\\        s  ->s+s\\s->[s][s]=s^{2}  \\[/tex]

IIn this case, the silver chromate has a Kps of [tex]4sx^{3}[/tex], same as the compound in options A and B, comparing these numbers you can't determine which one is bigger. Finally, options C and D have a kps of [tex]s^{2}[/tex], this value is smaller than silver chromate's kps.

I hope you find this information useful! good luck!

The solubility of silver chromate compared to PbF2, Ag2SO3, NiCO3, AgCl cannot be definitively determined without empirical data or additional information. Factors influencing solubility include temperature, nature of the solute and solvent, pressure, and presence of other substances. Ksp values alone don't provide sufficient comparisons.

Without empirical data or additional information, it isn't possible to definitively determine which of the compounds (PbF2, Ag2SO3, NiCO3, AgCl) silver chromate is more or less soluble than. Solubility often depends on various factors, including temperature, nature of the solute and solvent, pressure, and presence of other substances. The Ksp (solubility product constant) values, which are a measure of the amount of a compound that can dissolve in a solution, are unique to each substance and are empirically determined in a lab. Therefore, we cannot just compare the Ksp values to decide which compounds are more or less soluble than silver chromate.

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Answer:

3.3 %

Explanation:

According to the question , the following reaction takes place -

 Ba(OH)₂ + 2 HBr   →   BaBr₂  +  2 H₂O

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity

V = volume of solution in liter ,

n = moles of solute ,

According to the question ,

V = volume of Ba(OH)₂ = 19.5 mL = 0.0195 L    ( since , 1 ml = 10 ⁻³ L )

M = Molarity of Ba(OH)₂ = 0.374 M

The moles of Ba(OH)₂ can be calculated by using the above equation ,

M = n / V  

n = M * V = 0.374 M  *  0.0195 L  =  0.0072 mol

From the above balanced reaction ,

2 mol of HBr reacts with 1 mol  Ba(OH)₂

1 mol of HBr reacts with 1 / 2 mol  Ba(OH)₂

From the above data ,

1 mol HBr reacts with = 1 / 2 * 0.0072 mol  = 0.0036 mol

Hence , number of moles of HBr = 0.0036 mol

Now,

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

As calculated above ,

n = 0.0036 mol

As we know , the m = molecular mass of HBr =  81 g/mol

n = w / m  

w = n * m =  0.0036 mol  *  81 g/mol  = 0.2916 g

Now ,

mass % = mass of HBr /  mass of solution   * 100

mass % = 0.2916 g / 8.72 g * 100 = 3.3 %

To find the percent by mass of hydrobromic acid in the mixture, we need to use the concept of titration. We can calculate the moles of hydrobromic acid using the volume and concentration of the barium hydroxide solution used to neutralize the acid. Then, we can determine the percent by mass.

To find the percent by mass of hydrobromic acid in the mixture, we need to use the concept of titration. In a neutralization reaction, the moles of acid can be determined by multiplying the volume of the base solution with its concentration. This can be expressed using the formula:

Moles of acid = Volume of base solution (L) x Concentration of base solution (M)

In this case, we are given the volume and concentration of the barium hydroxide solution used to neutralize the hydrobromic acid. So, we can calculate the moles of hydrobromic acid and then determine the percent by mass.

Answer:

 Chemical equivalence:

The chemical equivalence is defined as, the point at which multiple protons are under same electronic condition, at that point they are artificially equal.

In the chemical equivalence, the weight of the substance in gram consolidates with or dislodges one gram of hydrogen. Substance counter parts as a rule are found by partitioning the equation weight by the valence.

The law of chemical equivalence is basically define as, the point at which  two substances respond, the reciprocals of one will be equivalent to the counterparts of other and the reciprocals of any item will likewise be equivalent to that of the reactant.

The mass of Benadryl that should be given to a dog weighing 26.6 kg is indeed 65 milligrams.

When calculating the appropriate dosage of Benadryl for a dog weighing 29.5 kg, it's important to consider that the recommended dosage is given per pound. Since the dog's weight is provided in kilograms, it's necessary to convert it to pounds for accurate dosage determination. Converting 29.5 kg to pounds results in approximately 64.7 pounds.

Convert the weight from kilograms to pounds:

29.5 kg × 1 lb / 0.454 kg ≈ 64.7 lbs

Calculate the mass of Benadryl in milligrams using the dog's weight in pounds: (1 mg/lb) × 64.7 lbs ≈ 64.7 mg

Rounding this to 65 mg ensures practicality. This process accounts for the difference in units (kilograms to pounds) and utilizes the given dosage information to arrive at the correct amount of Benadryl needed to treat the dog's itchy skin.

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To determine the appropriate Benadryl dosage for a 26.6 kg dog, you first convert the dog's weight to pounds (26.6 kg = 58.6 lbs). You then multiply the weight in pounds by the recommended dosage, which leads to a recommended dosage of 58.6 mg.

In order to calculate the appropriate dosage of Benadryl for dogs, you first transform the dog's weight from kilograms to pounds, as the given dosage is in milligrams per pound. Given that 1 kilogram is roughly equal to 2.20462 pounds,  you can find the weight of a 26.6 kg dog in pounds as follows:

26.6 kg * 2.20462 lbs/kg = 58.6 lbs

Next, you multiply the weight of the dog in pounds by the recommended dosage:

58.6 lbs * 1 mg/lb = 58.6 mg

So, a dog that weighs 26.6 kg should be administered a 58.6mg dose of Benadryl.

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Answer:

Magnitude of the aftershock = 0.3

Explanation:

Based on the information in the problem, an expression can be written that relates the magnitude of the earthquake (M₁) with the magnitude of the aftershock (M₂):

M₁ = 25M₂

We can then solve for M₂ and substitute in the values in the problem:

M₂ = M₁ / 25 = 6.3 / 25 = 0.3

Answer:

[tex]524.5903\mu m^{3}[/tex]

Explanation:

Given that, consider the model of a cell as a sphere.

The size of the human cell is [tex]10\mu m[/tex].

And its radius will become [tex]r_{c}=\frac{10\mu m}{2} =5\mu m[/tex]

And the size of the membrane is [tex]4 nm[/tex].

Now the radius of the cell with the membrane is,

[tex]r=r_{c}+r_{m}\\r=5\mu m+4nm\\r=5\mu m+0.004\mu m\\r=5.004\mu m[/tex]

Now volume with the membrane will be,

[tex]V=\frac{4}{3}\pi r^{3} \\V=\frac{4}{3}\pi (5.004)^{3}\\V=\frac{4}{3}\pi\times 125.30024\\V=524.5903\mu m^{3}\\[/tex]

This is the required volume of cell with the membrane.

Answer:

4.88 g / cm³

Explanation:

Density of a substance is given by the mass of the substance divided by the volume of the substance .

Hence , d = m / V

V = volume

m = mass ,

d = density ,

From the question ,

The mass of the metal = 24.54 g

The volume of the metal = 5.02 mL

Hence , by using the above formula ,and putting the corresponding values , the density is calculated as -

d = m / V

d = 24.54 g / 5.02 mL

d = 4.88 g /mL

The unit 1mL = 1 cm³

Hence ,

d = 4.88 g / cm³

Answer : The mass of carbon monoxide form can be 2.8 grams.

Solution : Given,

Moles of C = 0.100 mole

Mass of [tex]O_2[/tex] = 8.00 g

Molar mass of [tex]O_2[/tex] = 32 g/mole

Molar mass of CO = 28 g/mole

First we have to calculate the moles of [tex]O_2[/tex].

[tex]\text{ Moles of }O_2=\frac{\text{ Mass of }O_2}{\text{ Molar mass of }O_2}=\frac{8g}{32g/mole}=0.25moles[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

[tex]2C+O_2\rightarrow 2CO[/tex]

From the balanced reaction we conclude that

As, 2 mole of [tex]C[/tex] react with 1 mole of [tex]O_2[/tex]

So, 0.1 moles of [tex]C[/tex] react with [tex]\frac{0.1}{2}=0.05[/tex] moles of [tex]O_2[/tex]

From this we conclude that, [tex]O_2[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]C[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]CO[/tex]

From the reaction, we conclude that

As, 2 mole of [tex]C[/tex] react to give 2 mole of [tex]CO[/tex]

So, 0.1 moles of [tex]C[/tex] react to give 0.1 moles of [tex]CO[/tex]

Now we have to calculate the mass of [tex]CO[/tex]

[tex]\text{ Mass of }CO=\text{ Moles of }CO\times \text{ Molar mass of }CO[/tex]

[tex]\text{ Mass of }CO=(0.1moles)\times (28g/mole)=2.8g[/tex]

Therefore, the mass of carbon monoxide form can be 2.8 grams.

Final answer:

When 0.100 mol of carbon is burned with 8.00 g of oxygen, a maximum of 11.00 grams of carbon dioxide can be formed, assuming oxygen is the limiting reactant.

Explanation:

To determine how many grams of carbon dioxide (CO2) can form when burning carbon with oxygen, we look at the chemical equation for the combustion of carbon:

C(s) + O2(g) → CO2(g)

This reaction shows that one mole of carbon reacts with one mole of oxygen to produce one mole of carbon dioxide. First, we need to find the number of moles of oxygen that 8.00 grams corresponds to:

Number of moles of O2 = mass (g) ÷ molar mass of O2 = 8.00 g ÷ 32.00 g/mol = 0.25 mol

Since the reaction requires equal moles of O2 and C to produce CO2, and we have 0.100 mol of carbon, we are limited by the amount of oxygen because it is less than the amount of carbon. Therefore, all of the oxygen will be used. To find the mass of CO2 that can be formed:

Mass of CO2 = moles of O2 × molar mass of CO2 = 0.25 mol × 44.01 g/mol = 11.00 g of CO2

So, a maximum of 11.00 grams of carbon dioxide can be formed from the combustion of 0.100 mol of carbon with 8.00 g of oxygen.

Answer:

[tex]t_2 = 14.4 min[/tex]

Explanation:

Given data:

Number of frame is 12+ 8 = 20

Total filtrate is 360 lb

we know

For 1 plate area [tex]= \frac{65}{12} ft^2[/tex]

Then for 20 are PLATE [tex]= 20\tmes \frac{65}{12} ft^2 = 108.33 ft^2[/tex]

filtrate equation is given as

[tex]t\frac{\mu_s\times(\alpha v) V^2}{A^2(-\Delta P)}[/tex]

In the above equation only t and A is variable , all other terms are constant

Therefore we have

[tex]\frac{t_2}{t_1}= \frac{A_1}{A_2} = [\frac{65}{105.33}]^2 = 0.36[/tex]

[tex]t_2 = 0.36\times 40 = 14.4 min[/tex]

[tex]t_2 = 14.4 min[/tex]

Final answer:

To calculate the time it would take to produce 360lb of filtrate after adding 8 more frames to the filter, we can use the concept of filtration rate and the given information. Using the formula (360 lb * 40 mins) / (65 ft^2 + 8 * A ft^2), we find the time is approximately 14.40 mins.

Explanation:

To calculate the time it would take to produce 360lb of filtrate after adding 8 more frames to the filter, we can use the concept of filtration rate. The filtration rate is the amount of filtrate produced per unit of time per unit of filtration area. In this case, the filtration rate is given as 360 lb/40 mins/65 ft2.

After adding 8 more frames to the filter, the total filtration area becomes 65 ft2 + 8 * area of each frame. Let's assume the area of each frame is A ft2. The new filtration rate can be calculated by dividing the total filtration area by the time it would take to produce 360lb of filtrate, which is T mins. So, (360 lb/T mins) = (65 ft2 + 8 * A ft2)/(40 mins).

To find the value of T, we can rearrange the equation and solve for T: T = (360 lb * 40 mins) / (65 ft2 + 8 * A ft2). Substituting the initial values, we get T = (360 lb * 40 mins) / (65 ft2 + 8 * 0.5 ft2). After calculating, we find that T is approximately 14.40 mins.

Explanation:

As per the given data, at a higher temperature, at [tex]24^{o}C[/tex], the solution will occupy a larger volume than at [tex]20^{o}C[/tex].

Since, density is mass divided by volume and it will decrease at higher temperature.

Also, concentration is number of moles divided by volume and it decreases at higher temperature.

At [tex]20^{o}C[/tex], density of water=0.9982071 g/ml  

Therefore, [tex]\frac{concentration}{density}[/tex] will be calculated as follows.

                 = [tex]\frac{C_{1}}{d_{1}}[/tex]

                 = [tex]\frac{1.000 mol/L}{0.9982071 g/ml}[/tex]

                 = 1.0017961 mol/g  

At [tex]24^{o}C[/tex], density of water = 0.9972995 g/ml

Since, [tex]\frac{concentration}{density}[/tex] = [tex]\frac{C_{2}}{d_{2}}[/tex]

                           = [tex]\frac{C_{2}}{0.9972995}[/tex]

Also,             [tex]\frac{C_{1}}{d_{1}}[/tex] = [tex]\frac{C_{2}}{d_{2}}[/tex]

so,                   1.0017961 mol/g = [tex]\frac{C_{2}}{0.9972995}[/tex]

                      [tex]C_{2} = 1.0017961 \times 0.9972995[/tex]

                                  = 0.9990907 mol/L

Therefore, in 500 ml, concentration of [tex]KNO_{3}[/tex] present is calculated as follows.

             [tex]C_{2}[/tex] = [tex]\frac{concentration}{volume}[/tex]

               0.9990907 mol/L = [tex]\frac{concentration}{0.5 L}[/tex]  

               concentration = 0.49954537 mol

Hence, mass (m'') = [tex]0.49954537 mol \times 101.1032 g/mol[/tex] = 50.5056 g       (as molar mass of [tex]KNO_{3}[/tex] = 101.1032 g/mol).

Any object displaces air, so the apparent mass is somewhat reduced, which requires buoyancy correction.

Hence, using Buoyancy correction as follows,

                      m = [tex]m''' \times \frac{(1 - \frac{d_{air}}{d_{weights}})}{(1 - \frac{d_{air}}{d})}}[/tex]

where,          [tex]d_{air}[/tex] = density of air = 0.0012 g/ml

                     [tex]d_{weight}[/tex] = density of callibration weights = 8.0g/ml                      

                     d = density of weighed object

Hence, the true mass will be calculated as follows.

           True mass(m) = [tex]50.5056 \times \frac{(1 - \frac{0.0012}{8.0})}{(1 - (\frac{0.0012}{2.109})}[/tex]

             true mass(m) = 50.5268 g

                                  = 50.53 g (approx)

Thus, we can conclude that 50.53 g apparent mass of [tex]KNO_{3}[/tex] needs to be measured.

Explanation:

The number of moles of solute present in liter of solution is defined as molarity.

Mathematically,         Molarity = [tex]\frac{\text{no. of moles}}{\text{Volume in liter}}[/tex]

Also, when number of moles are equal in a solution then the formula will be as follows.

                     [tex]M_{1} \times V_{1} = M_{2} \times V_{2}[/tex]

It is given that [tex]M_{1}[/tex] is 8.00 M, [tex]V_{1}[/tex] is 7.00 mL, and [tex]M_{2}[/tex] is 0.80 M.

Hence, calculate the value of [tex]V_{2}[/tex] using above formula as follows.

                    [tex]M_{1} \times V_{1} = M_{2} \times V_{2}[/tex]

                 [tex]8.00 M \times 7.00 mL = 0.80 M \times V_{2}[/tex]

                      [tex]V_{2} = \frac{56 M. mL}{0.80 M}[/tex]

                                  = 70 ml

Thus, we can conclude that the volume after dilution is 70 ml.

Answer:

The correct option is: a) saturated

Explanation:

Relative humidity is a primary measurement of humidity. At a given temperature, relative humidity describes the present state of absolute humidity relative to the maximum humidity.

It is generally expressed as percentage. Therefore, 100% relative humidity means that the air is entirely saturated.

Explanation:

Molarity is defined as the number of moles of solute present in liter of solution.

Mathematically,         Molarity = [tex]\frac{\text{no. of moles}}{\text{Volume in liter}}[/tex]

Also, when number of moles are equal in a solution then the formula will be as follows.

                     [tex]M_{1} \times V_{1} = M_{2} \times V_{2}[/tex]

It is given that [tex]M_{1}[/tex] is 0.14 M, [tex]V_{1}[/tex] is 0.083 L, and [tex]V_{2}[/tex] is 1.0 L.

Hence, calculate the value of [tex]M_{2}[/tex] using above formula as follows.

                    [tex]M_{1} \times V_{1} = M_{2} \times V_{2}[/tex]

                 [tex]0.14 M \times 0.083 L = M_{2} \times 1.0 L[/tex]

                      [tex]M_{2} = \frac{0.01162 M.L}{1 L}[/tex]

                                  = 0.01162 M

Thus, we can conclude that the molarity of a solution is 0.01162 M.

Answer:

The correct option is: D)10 mL

Explanation:

A measuring cylinder or a graduated cylinder, is a narrow cylinder-shaped, chemical resistant, transparent equipment which is used to measure the volume of a given liquid.

Since the 10 mL graduated cylinder has 0.1 mL grading divisions. Therefore, a 10 mL graduated cylinder will precisely measure 8 mL liquid.

Answer:

The term half lime means: the time taken for the concentration of a reactant to decrease by a factor of 1/2.

Explanation:

In kinetics, the term half-life refers to the time that it takes to decrease the concentration of a reactant to half its initial concentration. Half-life depends on the reaction order, on the rate constant and, except for first-order kinetics, on the initial concentration of the reactant.

Answer:

b) Ion-dipole

Explanation:

Intermolecular forces are the forces of attraction or repulsion between molecules, they are significantly weaker than intramolecular forces like covalent or ionic bonds.

Considering this information we can conclude that Ion-Dipole interaction is the strongest force among intermolecular forces.

I hope this information is useful to you!

Answer: The percentage yield of aspirin is 38.02 %.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]      .....(1)

Given mass of salicylic acid [tex](C_7H_6O_3)[/tex] = 10.09 g

Molar mass of salicylic acid [tex](C_7H_6O_3)[/tex] = 138.12 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of salicylic acid}=\frac{10.09g}{138.12g/mol}=0.0730mol[/tex]

The chemical equation for the formation of aspirin follows:

[tex]C_7H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+CH_3COOH[/tex]

As, acetic anhydride is present in excess. So, it is considered as an excess reagent.

Thus, salicylic acid is a limiting reagent because it limits the formation of products.

By Stoichiometry of the reaction:

1 mole of salicylic acid produces 1 mole of aspirin.

So, 0.0730 moles of salicylic acid will produce = [tex]\frac{1}{1}\times 0.0730=0.0730mol[/tex] of aspirin

Now, calculating the mass of aspirin from equation 1, we get:

Molar mass of aspirin = 180.16 g/mol

Moles of aspirin = 0.073 moles

Putting values in equation 1, we get:

[tex]0.073mol=\frac{\text{Mass of aspirin}}{180.16g/mol}\\\\\text{Mass of aspirin}=13.15g[/tex]

To calculate the percentage yield of aspirin, we use the equation:

[tex]\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100[/tex]

Experimental yield of aspirin = 5.0 g

Theoretical yield of aspirin = 13.15 g

Putting values in above equation, we get:

[tex]\%\text{ yield of aspirin}=\frac{5.0g}{13.15g}\times 100\\\\\% \text{yield of aspirin}=38.02\%[/tex]

Hence, the percent yield of aspirin is 38.01 %.

When 3.00 g of CaCl₂ is added to a calorimeter containing 100 mL of water at 23.0°C, the final temperature is 28.2 °C.

First, we will convert 3.00 g of CaCl₂ to moles using its molar mass (110.98 g/mol).

[tex]3.00 g \times \frac{1mol}{110.98g} = 0.0270 mol[/tex]

The heat of solution (ΔHsoln) of CaCl₂ is −82.8 kJ/mol. The heat released by the solution of 0.0270 moles is:

[tex]0.0270 mol \times \frac{-82.8kJ}{mol} = -2.24 kJ[/tex]

According to the law of conservation of energy, the sum of the heat released by the solution (Qs) and the heat absorbed by the calorimeter (Qc) is zero.

[tex]Qs + Qc = 0\\\\Qc = -Qs = 2.24 kJ[/tex]

Assuming the density of water is 1 g/mL, we have 100 mL (100 g) of water and 3.00 g of CaCl₂. The mass of the solution (m) is:

[tex]m = 100g + 3.00 g = 103 g[/tex]

Finally, we can calculate the final temperature of the system using the following expression.

[tex]Qc = c \times m \times (T_2 - T_1)[/tex]

where,

c: specific heat of the solution (same as water 4.18 J/g.°C)

T₁ and T₂: initial and final temperature

[tex]T_2 = \frac{Qc}{c \times m} + T_1 = \frac{2.24 \times 10^{3}J }{(\frac{4.18J}{g.\° C} ) \times 103 g} + 23.0 \° C = 28.2 \° C[/tex]

When 3.00 g of CaCl₂ is added to a calorimeter containing 100 mL of water at 23.0°C, the final temperature is 28.2 °C.

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To determine the amount of heat involved in the dissolution of CaCl₂ and the final temperature of the solution, we can use the formula q = m * c * ΔT. First, we need to calculate the heat absorbed or released by water when 5.00 g of CaCl₂ is dissolved in 50.0 g of water. Assuming the specific heat of the solution is the same as water (4.18 J/g°C), we can calculate the heat.

To determine the amount of heat involved in the dissolution of CaCl₂ and the final temperature of the solution, we can use the formula q = m * c * ΔT, where q is the heat absorbed or released, m is the mass of the solution, c is the specific heat of the solution, and ΔT is the change in temperature.

First, we need to calculate the heat absorbed or released by water when 5.00 g of CaCl₂ is dissolved in 50.0 g of water. The mass of the solution is 55.0 g (50.0 g + 5.00 g), and the change in temperature is 39.2°C - 23.0°C = 16.2°C. Assuming the specific heat of the solution is the same as water (4.18 J/g°C), we can calculate the heat using the formula: q = 55.0 g * 4.18 J/g°C * 16.2°C = 3660.36 J.

Since 1 kJ = 1000 J, we can convert the heat to kilojoules: 3660.36 J ÷ 1000 = 3.66 kJ. Therefore, the amount of heat absorbed or released by water when 5.00 g of CaCl₂ is dissolved in 50.0 g of water is 3.66 kJ.

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Answer:

The velocity of flow in 10in pipe is 4.16 ft/s.

Explanation:

Given that

Specific gravity = 0.8

Viscosity =0.00042[tex]lbf/ft^2[/tex]

For pipe 1

[tex]V_1=6 ft/s,d_1=12\ in[/tex]

For pipe 1

[tex]V_2,d_1=10\ in[/tex]

If we assume that flow in the both pipe is laminar

For laminar flow through circular pipe

[tex]\dfrac{\Delta P}{L}=\dfrac{32V\mu }{d^2}[/tex]

So same pressure drop we can say that

[tex]\dfrac{V_1 }{d^2_1}=\dfrac{V_2}{d^2_2}[/tex]

[tex]\dfrac{6}{12^2}=\dfrac{V_2}{10^2}[/tex]

[tex]V_2=4.16 ft/s[/tex]

So the velocity of flow in 10in pipe is 4.16 ft/s.

Answer:

The correct option is: Activity coefficient            

Explanation:

Ideal solution is a solution that has thermodynamic properties similar to the ideal gases. The pressure of an ideal solution obeys the Raoult's law. An ideal solution has zero enthalpy of mixing and the activity coefficient of all the components of the solution is unity.

Example: The solution of 1-butanol and 2-butanol, is nearly ideal as the two chemical compounds or molecules are chemically similar.        

The new volume of the balloon that rose from a temperature of 25°C and 1.00 atm to a temperature of 20°C and 0.30 atm is calculated using the ideal gas law and is found to be 8.25 L.

In this problem, we can use the ideal gas law which states that the pressure times the volume of a gas is equal to the number of moles of gas times the gas constant times the temperature. Since the number of moles of gas and the gas constant remain constant, we can modify this equation to P1V1/T1 = P2V2/T2, which expresses the relationship between the initial and final state of the gas relative to its pressure, volume, and temperature.

First, we need to convert the temperatures from Celsius to Kelvin since the ideal gas law requires temperatures in Kelvin. So our initial temperature, T1, is 25°C + 273.15 K = 298.15 K and our final temperature, T2, is 20°C + 273.15 K = 293.15 K. Our initial and final pressures (P1 and P2) are 1.00 atm and 0.30 atm, respectively. And our initial volume (V1) is 2.50 L.

Plugging these values into the equation, we have: (1.00 atm * 2.50 L) / 298.15 K = (0.30 atm * V2) / 293.15 K.

By cross multiplying and solving for V2, we get: V2 = (1.00 atm * 2.50 L * 293.15 K) / (0.30 atm * 298.15 K) = 8.25 L. So the new volume of the balloon is 8.25 L.

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Answer:

K₅ is smaller because the reaction is slower due to steric and electronic effects.

Explanation:

K is the rate constant of the reaction. The higher the value of log K, the higher the value of K and the faster is the reaction.

The reaction can be represented by the following reaction:

6 NH₃ + [Cu(OH₂)₆]²⁺ → [Cu(NH₃)₆]²⁺ + 6 H₂O

This means that the reaction is exchanging the H₂O ligands by NH₃ ligands.

The more NH₃ ligands we add to the complex, the more difficult (slower) is the substitution. This happend because the addition of NH₃ ligands promotes a steric hindrance and electronic repulsion, which makes it harder for the next NH₃ to approach the complex and substitute the H₂O ligand.

This is the reason why K₅ is negative. The rate of this substitution is extremelhy low.

Explanation:

It is known that [tex]mv_{r} = \frac{nh}{2p}[/tex]

where,      m = mass of the electron

                 r = radius of the orbit

                 [tex]v_{r}[/tex] = orbital speed of the electron

Equation when the electron is experiencing uniform circular motion is as follows.

            [tex]\frac{Kze^{2}}{r^{2}} = \frac{mv^{2}}{r}[/tex] ........ (1)

Rearranging above equation, we get the following.

                        [tex]mv^{2} = \frac{Kze^{2}}{r}[/tex]

Also,         v = [tex]\frac{nh}{2pmr}[/tex] .......... (2)

Putting equation (2) in equation (1) we get the following.

                [tex]\frac{mn^{2}h^{2}}{4p^{2}m^{2}r^{2}} = \frac{Kze^{2}}{r}[/tex]

Hence, formula for radius of the nth orbital is as follows.

                 [tex]r_{n} = [\frac{h^{2}}{4p^{2}mKze^{2}}]n^{2}[/tex]

                   [tex]r_{n} = [5.29 \times 10^{-11}m] \times (6)^{2}[/tex]

                             = [tex]19.044 \times 10^{-10} m[/tex]

                             = [tex]19.044 A^{o}[/tex]

Thus, we can conclude that the value for the radius r for a n= 6 Bohr orbit is [tex]19.044 A^{o}[/tex].

Answer:

Rate constant k = 1.57*10⁻⁵ s⁻¹

Explanation:

Given reaction:

[tex]A\rightarrow B[/tex]

Expt    [A] M        [B] M         Rate [M/s]

1          3.40         4.16           1.82*10^-4

2         4.59         4.16           3.32*10^-4

3.        3.40          5.46          1.82*10^-4

[tex]Rate = k[A]^{x}[B]^{y}[/tex]

where k = rate constant

x and y are the orders wrt to A and B

To find x:

Divide rate of expt 2 by expt 1

[tex]\frac{3.32*10^{-4} }{1.82*10^{-4} } =\frac{[4.59]^{x} [4.16]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\x =2[/tex]

To find y:

Divide rate of expt 3 by expt 1

[tex]\frac{1.82*10^{-4} }{1.82*10^{-4} } =\frac{[3.40]^{x} [5.46]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\y =0[/tex]

Therefore: x = 2, y = 0

[tex]Rate = k[A]^{2}[B]^{0}[/tex]

To find k

Use rate for expt 1:

[tex]k = \frac{Rate1}{[A]^{2} } =\frac{1.82*10^{-4}M/s }{[3.40]^{2} } =1.57*10^{-5} s-1[/tex]

Answer:

At the start of the process, the volume not occupied by the water is 2 m3

Explanation:

At the start of the process you have a half full tank. It means that also a half is empty (not occupied by water).

Since the volume is 4 m3, 2 m3 are full (occupied by water) and 2 m3 (not occupied by water).

The volume in time will be

[tex]V(t)=V_0+(f_i-f_o)*t\\\\V(t) = 2 +(6.33/1000-3.25/1000)*t=2+0.00308*t \, \, [m3][/tex]