Question

What is the formula mass of 2-butene, `C_4H_8`?

Answer 1

`M_r(C_4H_8)=56`

Explanation:

`M_a(C) = 12`
`M_a(H) = 1`

`M_r(C_4) = 12 * 4 = 48`
`M_r(H_8) = 1 * 8 = 8`

`M_r(C_4H_8) = 48 + 8 = 56`
`M_r(C_4H_8)=56`