Decide which of the following statements are true and which are false. 1. Real g

Question

Decide which of the following statements are true and which are false.

1. Real gas molecules behave most ideally at high temperature and low pressure.

2. At constant temperature, the heavier the gas molecules, the larger the average velocity.

3. Ideal gas molecules have small volumes and exert weak attractive forces on one another.

4. In order for two separate 1.0 L samples of O2(g) and H2(g) to have the same average velocity, the O2(g) sample must be at a lower temperature than the H2(g) sample.

5. As temperature increases, the average kinetic energy of a sample of gas molecules decreases.

6. At constant temperature, the heavier the gas molecules, the smaller the average kinetic energy.

Explanation / Answer

1. Real gas molecules behave most ideally at high temperature and low pressure.(TRUE)

At high Temperature and low Pressure, the molecules in a real gas are far apart and exert little or no attractive force among themselves.

2. At constant temperature, the heavier the gas molecules, the larger the average velocity.(FALSE)

3. Ideal gas molecules have small volumes and exert weak attractive forces on one another.(TRUE)

4. In order for two separate 1.0 L samples of O2(g) and H2(g) to have the same average velocity, the O2(g) sample must be at a lower temperature than the H2(g) sample.(FALSE)

According to rate of diffusion , r = square root of (3RT/M)

R - gas constant

T - Temperature

M - molar mass

As the molar mass of H2 is less rate will be more

As the molar mass of O2 is more the rate will be less

In order to have same velocity, the H2(g) sample must be at a lower temperature than the O2(g) sample.

5. As temperature increases, the average kinetic energy of a sample of gas molecules decreases.(FALSE)

Average kinetic energy , K is proportional to T( Temperature)

So temperature increases, the average kinetic energy of a sample of gas molecules increases

6. At constant temperature, the heavier the gas molecules, the smaller the average kinetic energy.(TRUE)

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