A 1.185 g sample of a compound containing only carbon,hydrogen,and oxygen is burned in an excess of dioxygen,producing 2.264 g CO₂and 1.390 g H₂O.What mass of oxygen is contained in the original sample?

Question

Quizplus · Accepted Answer

The mass of carbon in the sample is calculated from the mass of CO2: (2.264 g CO2) * (12.01 g C / 44.01 g CO2) = 0.617 g C. The mass of hydrogen is calculated from the mass of H2O: (1.390 g H2O) * (2.016 g H / 18.015 g H2O) = 0.156 g H. The mass of oxygen in the sample is the total mass minus the mass of carbon and hydrogen: 1.185 g - 0.617 g - 0.156 g = 0.4117 g O.

A 1185 G Sample of a Compound Containing Only Carbon,hydrogen,and Oxygen