A sample of pure carbon weighing 1.48 g was burned in an excess of air. The mass of carbon dioxide, the sole product, was 5.42 g. In a second experiment, 11.62 g of carbon dioxide was obtained. What mass of carbon was burned in the second experiment?
A) 42.6 g
B) 3.17 g
C) 3.54 g
D) 0.866 g
E) 11.6 g

Question

Quizplus · Accepted Answer

The ratio of carbon to carbon dioxide in the first experiment is 1.48 g C to 5.42 g CO2. Using this ratio, for 11.62 g of CO2, the mass of carbon burned is (1.48/5.42) * 11.62 = 3.17 g.

A Sample of Pure Carbon Weighing 1