The ideal gas law may be applied also to a mixture of gases, such as air, assuming that the molecular weight is the average molecular weight of that mixture.

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The ideal gas law, PV = nRT, can be applied to a mixture of gases, but the molecular weight used in the calculation should be the average molecular weight of the mixture, which takes into account the individual molecular weights and their respective proportions.

The Ideal Gas Law May Be Applied Also to a Mixture