how many moles of gas Does it take to occupy 520 mL at a pressure of 400 torr and a temperature of 340 k

A.73.6 moles
B. 0.0098 moles
C.0.980 moles
D. 0.0735 moles

Answer:

AlCl₃.

Explanation:

Adding solute to water causes depression of the boiling point.

The depression in freezing point (ΔTf) can be calculated using the relation:

ΔTf = i.Kf.m,

where, ΔTf is the depression in freezing point.

i is the van 't Hoff factor.

van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.

Kf is the molal depression constant of water.

m is the molality of the solution (m = 1.0 m, for all solutions).

(1) NaCl:

i for NaCl = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (NaCl) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(2) MgCl₂:

i for MgCl₂ = no. of particles produced when the substance is dissolved/no. of original particle = 3/1 = 3.

∴ ΔTb for (MgCl₂) = i.Kb.m = (3)(Kf)(1.0 m) = 3(Kf).

(3) NaCl:

i for KBr = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (KBr) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(4) AlCl₃:

i for AlCl₃ = no. of particles produced when the substance is dissolved/no. of original particle = 4/1 = 4.

∴ ΔTb for (CoCl₃) = i.Kb.m = (4)(Kf)(1.0 m) = 4(Kf).

Answer: AlCl₃. :) de nada

The expression of 126.7 g in scientific notation results in 1.267 x 10^-1 kg.

To write 126.7 g in scientific notation, we need to convert it to kilograms. Since the base unit of mass in the SI system is the kilogram, we can express 126.7 g as 1.267 × 10-1 kg in scientific notation. Therefore, 126.7 g in scientific notation is 1.267 × 10-1 kg.

Answer:

A molecule is tetrahedral if the central atom has four bonds and no lone pairs. Explanation: ... The electron pairs in the bonds repel the electrons in the other bonds, so they all try to get as far from each other as possible.

According to the molecular geometry,four atoms bound to a central atom with no lone pairs would cause the shape of a molecule to be tetrahedral.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:

[tex]\boxed{\text{17.76 \% by mass}}[/tex]

Explanation:

[tex]\text{The mass of one molecule of NH$_{3}$ is:}\\\text{14.01 u N + 3.024 u H = 17.034 u}\\\\\text{mass $\%$ H} =\dfrac{3.024}{17.034} \times 100 \%} =\textbf{17.76 \%}\\\\\text{Ammonia contains }\boxed{\textbf{17.76 \% H by mass}}[/tex]

Answer:

there are 0.087 moles of ethanol in a 4.00 G sample of ethanol

Explanation:

Number of moles present in a substance is equal to the mass divided by molar mass.

Mathematically,      No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]

As it is given that mass is 4.00 g and molar mass of [tex]CH_{3}CH_{2}OH[/tex] is 46.07 g/mol.

Hence, calculate the number of moles of [tex]CH_{3}CH_{2}OH[/tex] as follows.

                 No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]

                                       = [tex]\frac{4.0 g}{46.07 g/mol}[/tex]

                                       = 0.086 mol

Thus, we can conclude that number of moles of [tex]CH_{3}CH_{2}OH[/tex] present in 4.00 g is 0.086 mol.

Answer:

Charge of the ions and size of the ions

Explanation:

Answer:

Lattice Energy

Explanation:

Melting point is the temperature at which a solid changes into a liquid.

The process is called as Melting.

Lattice energy is the energy required by an ionic compound in order to overcome the electrostatic force which is existing between the oppositely charged ions.

Ionic compound which has a strong electrostatic force will have high melting point .

Energy required to break the ionic bond or the Lattice array is more.

Lattice energy depends on two main factors

1) charge of the ions and

2) size of the ions

Lattice energy increases with the increase in charge.

For example Lattice energy of MgO is larger than NaCl.

Mg and O have 2+ and 2- charges respectively

Na and Cl have 1+ and 1- charges.

Lattice energy increases with decrease in size of the ions.

For example NaCl Lattice energy is larger than KBr.

[tex]Na^+[/tex] is smaller than [tex]K^+[/tex] ion  

[tex]Cl^-[/tex] is smaller than [tex]Br^-[/tex]

Answer:

1, 3, 4

Explanation:

Answer:

I just took the lesson

Explanation:

Animal obviously

It could be carnivore, herbivore or omnivore

Absolute zero is the lowest possible temperature and is the temperature at which all molecular motion ceases. It is measured on the Kelvin scale, where water freezes at 273 K and boils at 373 K.

Absolute zero is the lowest possible temperature and is the temperature at which all molecular motion ceases.

It is measured on the Kelvin scale, where water freezes at 273 K and boils at 373 K, with 0 K being absolute zero.

This temperature is significant in scientific work and is used in fields such as astronomy

Final answer:

Absolute zero is the theoretical temperature at which molecular motion stops, corresponding to 0 K, -273.15°C, or -459.67°F. It is the starting point of the Kelvin scale. The Celsius scale, more common in daily usage, has water's freezing point at 0°C and boiling point at 100°C.

Explanation:

Absolute zero is defined as the coldest possible temperature, a theoretical limit where all molecular motion ceases. This temperature corresponds to 0 Kelvin (K) on the Kelvin temperature scale and is equivalent to approximately -273.15 degrees Celsius (°C) and -459.67 degrees Fahrenheit (°F). The Kelvin scale is an absolute temperature scale used primarily in the sciences.

The Celsius scale is another temperature scale which is used widely around the world. On this scale, the freezing point of water is 0°C and the boiling point is 100°C at standard atmospheric pressure. This scale is more commonly used in daily life, but in scientific contexts, especially when dealing with thermodynamic temperature, the Kelvin scale is preferred because it starts from this absolute zero point.

To convert from Celsius to Kelvin, one simply adds 273.15 to the Celsius temperature. This is because the size of one unit on both the Celsius and Kelvin scales is the same; the only difference is their starting points (0°C is equivalent to 273.15K).

Answer:

1: it can produce crops that are resistant to pest

2: it can result in animals that can produce more food

Explanation:

i had the same question

Answer:

Cell membranes

Explanation:

Cell membranes is a feature that is common to prokaryotic and eukaryotic cells.

Answer:cell membranes

Explanation:

Answer:

Average atomic mass = 6.6575.

Explanation:

As fractions the abundance is 1/4 and 3/4.

The average atomic mass =  (5.03 + 3(7.20) / 4

= 6.6575.

Answer : The volume of NaOH stock solution used should be, 250 ml

Solution :

According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of NaOH solution = 0.50 M

[tex]V_1[/tex] = volume of NaOH solution = 3.0 L

[tex]M_2[/tex] = molarity of NaOH stock solution = 6.0 M

[tex]V_2[/tex] = volume of NaOH stock solution = ?

Now put all the given values in the above law, we get the volume of NaOH stock solution.

[tex](0.50M)\times (3.0L)=(6.0M)\times V_2[/tex]

[tex]V_2=0.25L=250ml[/tex]       (1 L = 1000 ml)

Therefore, the volume of NaOH stock solution used should be, 250 ml

At  [tex]\fbox{\begin \\363 K \end{minispace}}[/tex]  temperature, a sample of neon gas will occupy [tex]50.00 \text{ m}^{3}[/tex] volume.

Further Explanation:

The given problem is based on the concept of Charles’ law. Charles’ law states that “at constant pressure and fixed mass the volume occupied an ideal gas is directly proportional to the Kelvin temperature.”

Mathematically the law can be expressed as,

[tex]\fbox{ \begin \\ V \propto T \end{minispace}}[/tex]

Or,

[tex]\frac{V}{T}=k[/tex]

Here, V is the volume of the gas, T is Kelvin temperature, and k is proportionality constant.

Given information:

The initial volume of neon gas is [tex]40.81 \text{ m}^{3}[/tex] .

The final volume of neon gas is  [tex]50.00 \text{ m}^{3}[/tex].

The initial temperature value is [tex]23.5 \text{ } ^{\circ} \text{C}[/tex] .

To calculate:

The final temperature

Given Condition:

Solution:

Step 1: Modify the mathematical expression for Charles’ law for two different temperature and volume values as follows:

[tex]\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}[/tex]

Here,

Step 2: Rearrange equation (2) for .

[tex]\fbox {\begin \\T_{2}=\frac{(V_{2}) \times (T_{1})}{V_{1}}\\\end{minispace}}[/tex]                                                                  …… (2)

Step 3: Convert the given temperature  from degree Celsius to Kelvin.

The conversion factor to convert degree Celsius to Kelvin is,

[tex]T(\text{K}) = T(^{\circ}\text{C}) + 273.15[/tex]                                      …… (3)

Substitute [tex]23.5\text{ }^{\circ} \text{C}[/tex] for [tex]T(^{\circ}\text{C})[/tex]  in equation (3) to convert temperature from degree Celsius to Kelvin.

[tex]T(\text{K}) = 23.5 \text{ } ^{\circ} \text{C} + 273.15\\T(\text{K})= 296.65 \text{ K}[/tex]

Step 4: Substitute [tex]40.81 \text{ m}^{3}[/tex]  for [tex]V_{1}[/tex] ,  [tex]50.00 \text{ m}^{3}[/tex] for [tex]V_{2}[/tex]  and  [tex]296.65 \text{ K}[/tex] for [tex]T_{1}[/tex]  in equation (2) and calculate the value of [tex]T_{2}[/tex] .

[tex]T_{2}=\frac{(50.00 \text{ m}^{3}) \times (296.65 \text{ K})}{40.81 \text{ m}^{3}}\\T_{2}=363.45 \text{ K}\\T_{2} \approx 363 \text{ K}[/tex]

Important note:

Learn More:

1. Gas laws https://brainly.com/question/1403211

2. Application of Charles’ law https://brainly.com/question/7434588

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: States of matter

Keywords: neon, volume, occupies, temperature, Kelvin, degree Celsius, Charle’s law, constant pressure, fixed mass, 40.81 m^3 , 50.00 m^3 , 23.5 degree C , celsius , 363 K , sates of matter, initial volume, final volume, initial temperature, final temperature, V1 , V2 , T1 , T2 .

At 363.27 degrees temperature, in Kelvins, the gas occupies 50.00 cubic meters.

Charles' law (also known as the law of volumes) is an experimental gas law that describes how gases tend to expand when heated.

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that the volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

where,

[tex]V_1[/tex] and [tex]T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_1[/tex]and [tex]T_2[/tex] are the final volume and temperature of the gas.

Apply Charles' Law which states that the volume of a gas at constant pressure is directly proportional to the Kelvin temperature.

23.5 C = 273 + 23.5 = 296.5 degrees K.

40.81 / 296.5 = 50 ÷ x   where x is the required temperature.

x = 363.27 degrees.

Hence, At 363.27 degrees temperature, in Kelvins, the gas occupies 50.00 cubic meters.

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Answer:

P2 = 778.05 mm Hg = 1.02 atm

Explanation:

We are to find the final pressure (expressed in atm)  of a 3.05 liter system initially at 724 mm hg and 298 K which is compressed to a final volume of 2.60 liter at 273 K.

For this, we would use the equation:

[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]

where P1 = 724 mm hg

V1 = 3.05 L

T1 = 298 K

P2 = ?

V2 = 2.6 L

T2 = 173 K

Substituting the given values in the equation to get:

[tex]\frac{(724)(3.05)}{298} =\frac{P_2(2.6)}{173}[/tex]

P2 = 778.05 mm Hg = 1.02 atm

The exothermic reaction among the choices is B. iron rusting. An exothermic reaction is a reaction that releases heat. Rust is formed from the reaction of iron with oxygen. This reaction releases heat, hence, an exothermic reaction.

Further Explanation:

A. melting ice is an endothermic process. An endothermic process requires the absorption of energy from the surroundings. Heat is needed to change ice to liquid water. That is why, when ice is removed from the freezer and left on a warmer place it melts. The heat from the surroundings is absorbed by the ice causing it to change to liquid phase.

B. iron rusting is exothermic. Heat is released when oxygen and iron react to form rust.

C. dissolving sugar in water is an endothermic process. Heat is needed to break up the intermolecular forces of attraction holding the sugar molecules together. Also, adding heat makes the process of dissolution faster

D. dissolving ammonium nitrate in water is an endothermic process. A characteristic of endothermic reactions is that it turns the container of a substance colder. As the substance absorbs heat from the surroundings, the temperature of the surroundings, including the container, decreases. In exothermic reactions, heat is released to the surroundings making the container feel hotter during and after the reaction.

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Keywords: exothermic reaction, endothermic reaction

Answer:

Here's what I get.

Explanation:

Your argument makes sense. For example, the density of C₅H₁₂ is about 0.63 g/mL, and it increases gradually to a limit of about 0.83 g/mL.  

With the lower alkyl halides, the halogen atom is the major contributor to the mass of the molecule. The density of chloromethane is 2.2 g/mL.

As you increase the number of C atoms, the Cl atom becomes a smaller part of the molecule. The alkyl halide becomes more like an alkane.

By the time you have reached four C atoms, the density has reached a limiting value of about 0.89 g/mL.

Answer:

The nucleus of an atom consists of Protons and Neutrons.-A.

Answer:

Explanation:

The complete reaction equation is given as:

                         CO + 2H₂ ⇄ CH₃OH                       ΔH = -90.7kJmol⁻¹  

From the reaction equation, we know that:

According to Le Chatelier's principle, we know that "if any of the conditions of a system in equilibrium is changed, the system will adjust itself in order to annul the effect of the change".

For pressure changes:  

A change in pressure affects only equilibrium involving a gas or gases. An increase in pressure will shift the position of equilibrium to the side having smaller volume(or mole) and vice versa.

                          CO       +       2H₂ ⇄      CH₃OH

                          3 moles of gases        1 mole of gas

An increase in pressure will favor the production of more methanol since we have 3 moles of gas on the left hand side and just one mole of gas on the right hand side.

For temperature changes:

A rise in temperature shifts equilibrium to the direction that absorbs heat and vice versa. Since the reaction is exothermic in the forward reaction, a rise in temperature will favor the forward reaction. This would lead to the production of more methanol gas. A decrease in temperature will favor the backward reaction.

Answer:

The reaction isn't yet at equilibrium. The overall reaction will continue to move in the direction of the products.

Assumption: this system is currently at [tex]\rm 900^{\circ}C[/tex].

Explanation:

One way to tell whether a system is at its equilibrium is to compare its reaction quotient [tex]Q[/tex] with the equilibrium constant [tex]K_c[/tex] of the reaction.

The equation for [tex]Q[/tex] is quite similar to that for [tex]K_c[/tex]. The difference between the two is that [tex]K_c[/tex] requires equilibrium concentrations, while [tex]Q[/tex] can be calculated even when the system is on its way to equilibrium.

For this reaction,

[tex]\displaystyle Q = \rm \frac{[CS_2]\cdot [H_2]^{4}}{[CH_4]\cdot [H_2S]^{2}}[/tex].

Given these concentrations,

[tex]\displaystyle Q = \rm \frac{[CS_2]\cdot [H_2]^{4}}{[CH_4]\cdot [H_2S]^{2}} =\frac{1.51\times (1.08)^{4}}{1.15\times (1.20)^{2}} \approx 1.72[/tex].

The question states that at [tex]\rm 900^{\circ}C[/tex], [tex]K_c = 3.59[/tex]. Assume that currently this system is also at [tex]\rm 900^{\circ}C[/tex]. (The two temperatures need to be the same since the value of [tex]K_c[/tex] depends on the temperature.)

It turns out that [tex]Q = K_c[/tex]. What does this mean?

In which direction will the system move? At this moment, [tex]Q < K_c[/tex]. As time proceeds, the value of [tex]Q[/tex] will increase so that it could become equal to [tex]K_c[/tex]. Recall that [tex]Q[/tex] is fraction.  

[tex]\displaystyle Q = \rm \frac{[CS_2]\cdot [H_2]^{4}}{[CH_4]\cdot [H_2S]^{2}}[/tex]

When the value of [tex]Q[/tex] increases, either its numerator becomes larger or its denominator becomes smaller, or both will happen at the same time. However,

As time proceeds,

In other words, the equilibrium will move towards the products.

Answer:

Explanation:

Energy can be gained or lost in both physical and chemical changes.

Most physical changes involve energy gain or loss. For example:

Similar reasoning can be made about freezing, evaporation, condensation, and many other physical changes.

As per chemical changes, in order to the reactant substances break their bonds energy must be gained, and as new bonds are formed to constitute the product substaces energy is loss. The net change of energy will tell if the reaction is endothermic (net gain of energy) or exothermic (net release or loss of energy).

In order to meet the energy conservation law, the energy that is gained or lost by a substance is lost or gained by other substance.

As per the options b. and c. the law of conservation of mass states that energy can be never be created or destroyed, so those options are incorrect.

Answer:

frequency increases as wavelength decrease.

Explanation:

frequency = velocity/wavelength

Answer:

Frequncy increases, wavelength decreases

Explanation:

A wave can be defined as the repetitive pattern of a travelling energy. Waves can also be defined as a disturbance from equilibrium (or rest) of a medium which oscillates along a stable region. Examples of waves include: seismic waves, gravitational waves, shock waves, heat waves, sound waves etc

In a standing wave (ie at different points of the wave, amplitude is constant), its properties are:

Amplitude which is the the distance of the disturbance from equilibrium. It can also be defined as the distance between the highest point of the wave(peak or crest) to the lowest point (trough).

Wavelength(lambda) is the distance between one peak to the next peak or one trough to another trough parallel to the direction of propagation.

Frequency, f is the number of times a wave passes a particular point per unit time.

Wave velocity is the speed at which disturbance moves. It can given as an equation:

V = f*(lambda)

It can also be written as:

f = V/(lambda)

From the relationship above,

We can see that an increase in frequency of the wave would lead to a decrease in its wavelength and vice versa.

Answer:

2

Explanation:

The valency of an atom is the number of H atoms to which it can bond.

An atom of X can bond to two H atoms, so the valency of X is 2.

Answer:

0.7M

Explanation:

Volume of NaOH = 35mL = 0.035L

Concentration of NaOH = 0.5M

Volume of HCl = 25mL = 0.025L

Concentration of HCl = ?

Solution;

The balanced equation of the reaction is shown below:

              NaOH + HCl  → NaCl + H₂O

To solve this problem, we solve from the known to the unknow. The known here is the parameters of NaOH. From here, we can find the number of moles;

Number of moles of NaOH = concentration x volume= 0.035 x 0.5

                                             = 0.0175mole

From the balanced reaction equation, we can state that:

       1 mole of NaOH reacted with 1 mole of HCl

         0.0175mole of NaOH will reacted with 0.0175mole of HCl

Now that we know the number of moles of the acid used, we can calculate the concentration of the acid used using the expression below:

  Concentration of acid = [tex]\frac{number of moles of acid}{volume of acid}[/tex]

 Concentration of acid= [tex]\frac{0.0175}{0.025}[/tex] = 0.7M

Answer:

Molecules of different gases with the same mass and temperature always have the same average kinetic energy - E.

Answer:

Molecules of different gases with the same mass and temperature always have the same average kinetic energy.

Answer:

A) dipole-dipole force

Explanation:

A dipole-dipole force is the type of intermolecular force that occurs between polar molecules.

The intermolecular force occurs between polar molecules is dipole-dipole bonding. The correct option is A)

Intermolecular forces are those forces that occur when two atom, molecules or ions come close together. There are different types of intermolecular force present between different molecules.

Thus, the correct option is A) dipole-dipole force

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Answer:

39698

Explanation:

Mass= 4.6kg

latent heat= 863

ML= 4.6*863= 39698

approximately = 397 In three significant figures

Answer : The specific latent heat of fusion of ice is, 187.608 J/g

Explanation :

Formula used :

[tex]Q=m\times L_f[/tex]

where,

Q = heat supply = 863 KJ = 863000 J

conversion used : (1 KJ = 1000 J)

m = mass of the substance = 4.6 Kg = 4600 g

conversion used : (1 Kg = 1000 g)

[tex]L_f[/tex] = specific latent heat of fusion = ?

Now put all the given values in the above formula, we get the specific latent heat of fusion of ice.

[tex]863000J=4600g\times L_f[/tex]

[tex]L_f=187.608J/g[/tex]

Therefore, the specific latent heat of fusion of ice is, 187.608 J/g

Answer:

cell walls

Explanation:

because the rigid structure that surrounds the cell membrane and provides support to the cells

Answer:

A. Cell wall

B. Cell membrane

Hope this Helps!

Answer:

Biodiversity is the variety of life in the world or in a particular habitat or ecosystem.

Explanation:Biodiversity is the shortened form of two words "biological" and "diversity." It refers to all the variety of life that can be found on Earth (plants, animals, fungi and micro-organisms) as well as to the communities that they form and the habitats in which they live.

Final answer:

Biodiversity represents the variety and complexity of life on Earth, encompassing the many species, genetic variations, and ecosystems.

Explanation:

Biodiversity refers to the variety of life and its processes, which includes the diversity of living organisms, the genetic differences among them, and the communities and ecosystems in which they occur. The term encompasses everything from the smallest bacteria to the largest plants and animals.

While scientists have identified about 1.9 million species, it is estimated that the true number of species ranges from 5 to 30 million. This diversity can be measured at three levels: species diversity, genetic diversity, and ecosystem diversity. Biodiversity is essential as it contributes to the resilience of ecosystems and to our planet's overall health.