# An ideal gas equation can be written as P = ρRT/M0 where ρ and M0 are respectively,

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An ideal gas equation can be written as $P={\rho RT\over M_0}$ where $\rho$ and $M_0$ are respectively,

(1) Number density, mass of the gas

(2) Mass density, mass of the gas

(3) Number density, molar mass

(4) Mass density, molar mass

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Ans: (4) Mass density, molar mass

Sol. Perfect gas equation can be written as

$PV=\mu RT$

$PV={M\over M_0}RT$

$P=\left({M\over V}\right){RT\over M_0}$

$P={\rho RT\over M_0}$

where $\rho$ is mass density and $M_0$ is molar mass.

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Ans : (4) Mass density, molar mass