Q.

The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. lts molecular formula is

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a

C3H6

b

C3H8

c

CH2

d

C2H2

answer is A.

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Detailed Solution

Weight of empirical formula,CH2=12+(1×2)=12+2=14Mass of one mole of the compound = its molecular weight                                                      = 42n= Mol. wt.  Empirical formula wt. =4214=3∴  Mol. formula =( empirical formula )×n=CH2×3=C3H6
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The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. lts molecular formula is