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Question

A 34.5-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0ºC, is burned in excess oxygen, liberating 2.20x103kJ of heat at constant pressure. What is the identity of the hydrocarbon? (R=0.0821L·atm/(K·mol))

SubstanceHºf(kJ/mol)
CO2(g)-393.5
H2O(l)-285.8

A) propylene (C3H6, Hºf= 20.41 kJ/mol)
B) ethylene (C2H4, Hºf= 52.47 kJ/mol)
C) acetylene (C2H2, Hºf= 226.73 kJ/mol)
D) ethane (C2H6, Hºf= "84.68 kJ/mol)
E) propane (C3H8, Hºf= "104.7 kJ/mol)

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