The density of a gas is $1.78 g L^{- 1}$ at STP. The weight of one mole of gas is:

39.9 g

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22.4 g

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3.56 g

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29 g

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Solution

The correct option is A $39.9 g$
Density $= 1.78 g L^{- 1}$ at STP

mass of $1 L$ gas $= 1.78 g$

1 mol of gas at STP $= 22.4 L$

$∴$ mass of $22.4 L$ gas $= 22.4 \times 1.78 = 39.872 g$

Option $A$ is correct.

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