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Q.

A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. It's density is 2.28 g/litre at 300 K and 1.0 atm pressure. Determine the molecular formula of the compound :

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a

C2H2

b

C2H4

c

C4H8

d

C4H10

answer is C.

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Detailed Solution

d=PMRT⇒M=dRTP=2.28×0.0821×3001=56.15g/molE.F. =85.712:14.31=7.14:14.3=1:2;
∴E.F.is CH2; M.F. =CH2n
Where n=56.1512+2≃4
∴M.F.is C4H8

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