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Question

The density of gas is 1.78g/l at stp the weight of one mole of gas is ___
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Solution

Molar gas volume at stp is :

1 mole = 22400 cm³ = 22.4 litres

Density = mass / volume

Density = 1.78g/litre

Volume = 22.4 litres

Mass = volume × density

1.78 × 22.4 = 39.872 g


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