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