The density of a gas is equal to ...... ($P =$ pressure,$V =$ volume,$T =$ temperature,$R =$ gas constant,$n =$ number of moles,and $M_w =$ molecular weight):
- A$nP$
- B$\frac{P M_w}{RT}$
- C$\frac{P}{RT}$
- D$\frac{M_w}{V}$
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