One litre of a gas at NTP weighs 1.97 g. Find the molecular mass of gas.

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Solution

$22.4$ litre of a gas at STP $=$ molecular mass
$1$ litre of a gas at STP $= 1.97$
22.4 liter of a gas at STP $= \frac{1.97 \times 22.4}{1}$
$= 44.128$
Molecular Mass $= 44.1$

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