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The empirical formula of a gaseous compound is CH2 .The density of the compound is 1.25 gm/lit.at S.T.P. The molecular formula of the compound is :

A)C2H4

b)C3H6

C)C6H12

D)C4H8

 

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The correct option is A) C2H

explaination: 

Since, 1 lite contains 1.25 gms.
Hence 22.4 litres contain(1.25×22.4)gms≡28gms.
So molar mass ≡28gms/mass=
 C2H

 

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