The Heat Combustion of Acetylene, C₂H₂(g), at 25°C, Is -1299

question 73

Multiple Choice

The heat combustion of acetylene, C₂H₂(g) , at 25°C, is -1299 kJ/mol. At this temperature, H°_f values for CO₂(g) and H₂O(l) are -393 and -286 kJ/mol, respectively. Calculate H°_f for acetylene.

• A) 227 kJ/mol
• B) -625 kJ/mol
• C) 625 kJ/mol
• D) 2376 kJ/mol
• E) none of these

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