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In a gas equation, \( P V=R T, V \) refers to the volume of:

1. any amount of a gas
2. one gram mass of a gas
3. one gram mole of gas
4. one litre of gas

Correct answer: one gram mole of gas

Solution

The equation PV = RT is the ideal gas equation written for one mole of gas, where R is the universal gas constant. Therefore, V represents the molar volume, i.e., the volume occupied by one gram mole of gas under the given conditions.

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