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Question

If one cubic dm of a gas weighs 2.5 g at STP, its molecular weight (in gram) is :

A
56 g
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B
11.2 g
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C
22.4 g
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D
224 g
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Solution

The correct option is A 56 g
1 dm3 weighs 2.5 g, then 22.4 dm3 weighs 22.4×2.5=56 g

1 mole of gas at STP occupies 22.4 dm3.

Molecular weight is the weight of 1 mole of gas so the weight is 56 g

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