The Heat of Combustion Per Mole for Acetylene,C₂H₂(g),is -1299

question 140

Multiple Choice

The heat of combustion per mole for acetylene,C₂H₂(g) ,is -1299.5 kJ/mol.Assuming that the combustion products are CO₂(g) and H₂O(l) ,and given that the enthalpy of formation is -393.5 kJ/mol for CO₂(g) and -285.8 kJ/mol for H₂O(l) ,find the enthalpy of formation of C₂H₂(g) .

• A)-846.1 kJ/mol
• B)-620.2 kJ/mol
• C)-226.7 kJ/mol
• D)+226.7 kJ/mol

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