A 2.841 g sample of a hydrocarbon is burned in an excess of dioxygen,producing 7.794 g CO₂and water.What mass of hydrogen is contained in the original sample?

Question

Quizplus · Accepted Answer

The mass of carbon in the CO2 can be calculated using the molar mass of CO2 (44.01 g/mol) and the molar mass of carbon (12.01 g/mol). The mass of carbon is (7.794 g CO2) * (12.01 g C / 44.01 g CO2) = 2.126 g C. The mass of hydrogen in the hydrocarbon is the difference between the total mass of the hydrocarbon and the mass of carbon: 2.841 g - 2.126 g = 0.714 g H.

A 2841 G Sample of a Hydrocarbon Is Burned in an an Excess