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  4. The density of a gas is 1.78 g L-1 at STP . The weight of one mole of a gas is

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

Some Basic Concepts of Chemistry

Solution:

$1$ mole occupies a volume of $22.4\, L$ at $STP$
Mass of $1$ mole of gas = Density $\times$ Volume
$=1.78 \times 22.4= 39.9\,g$