Cyclopropane, a Gas Containing Only Carbon and Hydrogen, Is an Anesthetic

Multiple Choice

Cyclopropane, a gas containing only carbon and hydrogen, is an anesthetic.
If 0.450 L of cyclopropane at 120°C and 0.720 atm reacts with excess O₂ to give 1.35 L of CO₂(g) and 1.35 L of H₂O(g) at the same temperature and pressure, what is the percent by weight of carbon in cyclopropane?

A) 33.3%
B) 41.8%
C) 45.0%
D) 85.7%
E) 90.0%