Mole ConceptHard

Question

It was found from the chemical analysis of a gas that it has two hydrogen atoms for each carbon atom. At 0o C and 1 atm, its density is 1.25 g per litre. The formula of the gas would be

Options

A.CH2
B.C2H4
C.C2H6
D.C4H8

Solution

$1.25 \times 22.4 = (1 \times 12 + 2 \times 1) \times n \Rightarrow n = 2$

⇒ Molecular formula = (CH2)2 = C2H4

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