JAMB - Chemistry (2024 - No. 41)

The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\) and a molar mass of 30 is

C\(_2\)H\(_4\)

C\(_3\)H\(_3\)

C\(_2\)H\(_6\)

C\(_6\)H\(_6\)

Empirical formula x n = Molecular mass

(CH\(_3\) ) X n = 30 ; Given that C = 12, H = 1

[ 12 + (1x3) ] n = 30

15n = 30

n = \(\frac{30}{15}\)

n = 2.

Molecular formula = (CH\(_3\) ) X n = (CH\(_3\) ) X 2 = C\(_2\)H\(_6\)