Methane, CH₄(g), Reacts with Steam to Give Synthesis Gas, a Mixture

Multiple Choice

Methane, CH₄(g) , reacts with steam to give synthesis gas, a mixture of carbon monoxide and hydrogen, which is used as starting material for the synthesis of a number of organic and inorganic compounds. CH₄(g) + H₂O(g) → CO(g) + H₂(g) [unbalanced]
What mass of hydrogen is formed if 275 L of methane (measured at STP) is converted to synthesis gas?

A) 12.3 g
B) 24.7 g
C) 37.1 g
D) 49.4 g
E) 74.2 g