First slide

Gaseous state

Question

If 300 mL of a gas weighs 0.368 g at STP, molar mass of the gas is

Moderate

A

$27 .48 g {mol}^{- 1}$
B

$110 .4 g {mol}^{- 1}$
C

$54 .98 g {mol}^{- 1}$
D

$55 .2 g {mol}^{- 1}$

Solution

$300 mL = 0 .368 g at STP ∴ 22400 mL = \frac{0 .368}{300} \times 22400 g {mol}^{- 1} = 27 .48 g {mol}^{- 1}$

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