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If the average molar mass of air is $29.0\text{ g/mol}$, what is the density of air at STP?

$R=0.0821\cfrac{L\times atm}{mol\times K}$

A

${\rho}_{air}=1.9\text{ g/L}$

B

${\rho}_{air}=1.3\text{ g/L}$

C

${\rho}_{air}=2.2\text{ g/L}$

D

${\rho}_{air}=0.97\text{ g/L}$

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