Vapour density of gas X
= Wt\ of\ certain\ volume\ of\ gas\ at\ STP\over Wt\ of\ same\ volume\ of\ H_2\ at\ STP
= 85\over 8.5
= 10
Molecular weight = 2 × Vapour density
= 2 × 10 = 20 g
Hence, molecular weight of gas X is 20 g
Vapour density of gas X
= Wt\ of\ certain\ volume\ of\ gas\ at\ STP\over Wt\ of\ same\ volume\ of\ H_2\ at\ STP
= 85\over 8.5
= 10
Molecular weight = 2 × Vapour density
= 2 × 10 = 20 g
Hence, molecular weight of gas X is 20 g
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