The weight of $1$ mole of a gas of density $0.1784$ g/L at NTP is :

0.1784 g

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1 g

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4 g

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4 a m u

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Solution

The correct option is C $4 g$
Density of the gas $= 0.1784 g / L$
Weight of $1$ litre of gas is $= 0.1784$ g.
Weight of $22.4$ litres of gas is = $0.1784 \times 22.4$ g $= 4$ g.
Since 1 mol of gas occupy 22.4 L

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