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Question

At STP conditions, 11.2 L of a gas weighs 24 g. So the molecular weight of gas is:

A
48 gm
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B
24 gm
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C
12 gm
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D
18 gm
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Solution

The correct option is A 48 gm
At STP, 1 mole of a gas corresponds to 22.4 L ,
So 11.2 L of gas corresponds to 0.5 mole.
It is given that 11.2 L corresponds to 24 gm, thus 22.4 L corresponds to 48 gm.
Weight of 1 mole = Molecular weight.
Molecular weight = 48 gm

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