51. When 10 cm3 of a gaseous hydrocarbon is burned in excess oxygen, the products consistof 30 cm3of carbon dioxide and 30 cm3of water vapor, measured under the sameconditions of temperature and pressure. Determine the molecular formula of thehydrocarbon CxHy.
(A) x=2, y=4
(B) x=3, y=6
(C) x=4, y=8
(D) x=5, y=10