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Which expression gives the molar mass $M$ of an ideal gas of density $d$ at pressure $P$ and temperature $T$ ?

A $M = \frac{d RT}{P}$
B $M = \frac{PRT}{d}$
C $M = \frac{d P}{RT}$
D $M = \frac{RT}{d P}$

Answer: A

P V = \frac{w}{M} RT

and

d = w / V

, so

PM = d RT

and

M = \frac{d RT}{P}

.

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