Question

as the molecular mass of hydrocarbons increases the ratio of number of H and C atoms :
a) decreases
b) increases
c) remains same
d) none of these​

Answer 1

Answer:

Mass ratio of C:H=3:1

As, molar mass ratio of C:H=12:1

Now, ratio of mass ratio and molar mass ratio is :

Molarmassratio(CandH)

Massratio(CandH)

=

12:1

3:1

=3:12=1:4 (CandH)

Therefore, for every C atom, there are 4 H atoms, hence empirical formula =CH

4

.