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If P, V, M, T and R are pressure, Volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by:

1. RT / PM
2. P / RT
3. M / V
4. PM / RT

Correct answer: M / V

Solution

Density is mass per unit volume, so for an ideal gas, it is given by the molar mass divided by the volume.

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