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Praxis II General Science

Category - Major Ideas

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Which of the following is not one of the assumptions that are used in the ideal gas law?

Gas molecules have no volume.
Gas molecules have no mass.
Gas molecules exert no forces other than repulsive collision forces.
Gas molecules make completely elastic collisions.
The average kinetic energy of a gas molecule is directly proportional to the temperature of the gas.

Explanation

Answer: B - In the idea gas law, several assumptions are made, including answers A, C, D, and E, but the ideal gas law requires that gas molecules have a mass. However, ideal gases do not have attractive forces and are able to perfectly conserve energy, which is never true of real gases.

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