Question

What is the %age composition of an elements Carbon , Hydrogen in the
hydrocarbon molecules:
Methane​

Answer 1

atomic mass of carbon =12

atomic mass of hydrogen =1

molecular mass of ch4=12+1×4

=12+4

=16

percentage composition of c in (ch)4=12/16×100

=75%

percentage composition of H in (ch)4=4/16×100

=25%

Explanation:

to find the percentage composition of each element we need to know the. molecular mass of the compound and then we can do percentage composition

hope it helps you...