Question

A hydrocarbon contain 85.7% C and 14.3% H by
mass. The molecular mass of the compound is 42
The molecular formula of hydrocarbon is
(1) CH2
(2) C3H6
(3) CH3
(4) C3H8​

Answer 1

Answer:

(to find out simple ratio we have take the smallest ratio like 7.1 and then we have to divide it with itself and with other ratio like 14.2, we will get simple ratio of carbon as 1 and hydrogen as 2. )

Empirical formula is CH2

Empirical formula mass : 14 g

now,

n = (molecular mass)/empirical formula

mass

= 42/14

= 3

now, (multiplying the n with the number of atoms of empirical formula i.e

C1*3H2*3 )

Molecular formula is C3H6 .

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Answer 2

hope it is helpful to you