One litre of a gas at STP weighs 1.16 g. It | vedclass

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(A) At $STP$,the volume of $1 \ mol$ of any ideal gas is $22.4 \ L$.Given that $1 \ L$ of the gas weighs $1.16 \ g$.Therefore,the molar mass of the ga

Vedclass · Accepted Answer

$C_2H_2$

Vedclass · Answer

(A) At $STP$,the volume of $1 \ mol$ of any ideal gas is $22.4 \ L$.Given that $1 \ L$ of the gas weighs $1.16 \ g$.Therefore,the molar mass of the gas is the weight of $22.4 \ L$ of the gas at $STP$.Molar mass $= 1.16 \ g/L 	imes 22.4 \ L/mol = 25.984 \ g/mol \approx 26 \ g/mol$.Comparing this with the molar masses of the options:$C_2H_2 = (2 	imes 12) + (2 	imes 1) = 26 \ g/mol$.$CO = 12 + 16 = 28 \ g/mol$.$O_2 = 2 	imes 16 = 32 \ g/mol$.$CH_4 = 12 + (4 	imes 1) = 16 \ g/mol$.Thus,the gas is $C_2H_2$.

One litre of a gas at $STP$ weighs $1.16 \ g$. It can possibly be:

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