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August 20, 2014

Homework Help: chemistry

Posted by chemistry on Wednesday, March 30, 2011 at 12:09am.

A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0C,
is burned in excess oxygen, liberating 4.24 10^3 kJ of heat at constant pressure. What
is the identity of the hydrocarbon? (R = 0.0821 L atm/(K mol))
Substance Hf (kJ/mol)
CO2(g) 393.5
H2O(l) 285.8
A) ethane (C2H6, Hf = 84.68 kJ/mol)
B)B) ethylene (C2H4, Hf = 52.47 kJ/mol)
C) propane (C3H8, Hf = 104.7 kJ/mol)
D) acetylene (C2H2, Hf = 226.73 kJ/mol)
E) propylene (C3H6, Hf = 20.41 kJ/mol)

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