Since the emperical formula is given as CH2, in order to find the molecular formula of it you have to use the formula:

N(the molar mass of emperical formula) = molar mass of compound

in this case, n(14)=70

Therefore, n=5

and thus, molecular formula will be, C5H10

N(the molar mass of emperical formula) = molar mass of compound

in this case, n(14)=70

Therefore, n=5

and thus, molecular formula will be, C5H10