Question

A 120.1 g sample of an unknown compound made of only carbon, hydrogen, and oxygen undergoes combustion analysis. 176.0 g of carbon dioxide and 72.0 g of water are collected as the only products. Compute the mass of oxygen consumed by the combustion reaction.

A) 16.1 g
B) 18.1 g
C) 20.1 g
D) 22.1 g

Answer 1

The mass of oxygen consumed by the combustion reaction is 64.0 g.

Step-by-step explanation:

To determine the mass of oxygen consumed by the combustion reaction, we need to calculate the mass of oxygen in the unknown compound. The mass of carbon dioxide produced is 176.0 g, and the mass of carbon in carbon dioxide is 12.01 g/mol.

Therefore, the mass of oxygen in carbon dioxide is (176.0 g) * (1 mol CO₂ / 44.01 g CO₂) * (2 mol O / 1 mol CO₂) * (16.00 g O / 1 mol O) = 64.0 g.