If you could add an explanation that would be nice too :) thanks

First you find the atomic mass of CH2
they give you the mass so it is
12.01+ (2 x 1.008) (because there’s 2 H)
= 14.026
divide 70.13/14.026= 5
now you multiply the coefficient by 5 so
CH2 becomes C5H10
hope that helped

Ithink the answer is d.

Is a renewable energy source that's highly environmentally friendly.hope this is what you're looking for. have a great day! : d