The relative formula mass of a gas is and its empirical formula is

CHEMISTRY · Single correct · A Level · Chemistry · Amount of substance · Amount of substance

Problem

The relative formula mass of a gas is

56

and its empirical formula is

\text{CH}_2

. What is the molecular formula of the gas? (1)

\text{CH}_2

(2)

\text{C}_2\text{H}_4

(3)

\text{C}_3\text{H}_6

(4)

\text{C}_4\text{H}_8