Question

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

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

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

True False  At constant temperature, the heavier the gas molecules, the smaller the average velocity.

True False  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.

True False  At constant temperature, the heavier the gas molecules, the larger the average kinetic energy.

True False  As temperature decreases, the average kinetic energy of a sample of gas molecules decreases.

Answer 1

False  

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

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False  

Ideal gas molecules have zero volumes and exert no attractive forces on one another.

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True

Average velocity,

Average velocity of a gas is inversely proportional to the square root of the molar mass of the gas. Hence, at constant temperature, the heavier the gas molecules, the smaller the average velocity.

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True

Molar mass of oxygen is higher than the hydrogen. Thus to have same average velocity the O₂(g) sample must be at a lower temperature than the H₂(g) sample.