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Question
A gas of 32 g mass has a volume of 20 litres at STP. Calculate the gram molecular weight of the gas.
Solution
Mass of gas = 32 g
Volume occupied by 32g of gas = 20litres
No. of moles = `"Volume of gas"/22.4`
= `20/22.4` = 0.9 moles
Gram molecular weight of gas = `"Mass of gas"/"No. of moles"`
=`32/0.9` = 35.55gm
Gram molecular weight of gas = 35.55g.
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