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Ideal gas equation – density
Concepts tested here
- gas-density-molecular-mass
All Questions
2016 Phase II 1 question
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A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas?
$\rho = nm = (P/kT)m$.
Gas equation: $\frac{P}{\rho} = \frac{RT}{M_w}$
$\rho = \frac{PM_w}{RT} = \frac{P\times(mN_A)}{kN_AT} = \frac{Pm}{kT}$