Question

Carbon monoxide reacts with H2 to produce dihydrogen monoxide (water) and octane (an alkane). Calculate the mass of dihydrogen monoxide produced if 12.88 g of H2 fully reacts.

a) 18 g
b) 36 g
c) 54 g
d) 72 g

Answer 1

The mass of dihydrogen monoxide produced can be calculated using the molar masses of CO2 and H2O, and their ratios in the reaction.

Step-by-step explanation:

Upon combustion, 1 mol of CO2 is produced for each mole of carbon atoms in the original sample.

Similarly, 1 mol of H2O is produced for every 2 mol of hydrogen atoms present in the sample.

The masses of carbon and hydrogen in the original sample can be calculated from these ratios, the masses of CO2 and H2O, and their molar masses.

Because the units of molar mass are grams per mole, we must first convert the masses from milligrams to grams: