Question

A compound has an empirical formula of CH2 and a molar mass of 56 g. What is its molecular formula?

O C5H10
O C4H8
O C3H6
O C2H4

Answer 1

C4H8

Step-by-step explanation:

calculate the amount of grams each formula turns out to be

C5 = 60.05g well C5 is already larger than 56g so its not A

C4= 48.04g and H8= 8.08g, 48.04 + 8.08 = 56.12 so this is really close to our answer

C3 = 36.03g and H6= 6.06g, 36.03 + 6.06 = 42.09

C2 = 24.02g and H4 = 4.04g, 24.02 + 4.04 = 28.06

so the answer would be C4H8

Answer 2

C4H8

Step-by-step explanation:

First find the molar mass of CH2;

2(1.01) + 1(12.01) = 14.03g

Now divide the molar mass of the compound by the molar mass of CH2;

56g/14.03g = 3.9914 Round to nearest whole number = 4

Multiply CH2 by 4 to get the molecular formula;

CH2* 4 = C4H8