The Enthalpy of Combustion of Acetylene C₂H₂ Is Described by C₂H₂(g)

question 104

Multiple Choice

The enthalpy of combustion of acetylene C₂H₂ is described by C₂H₂(g) + (5/2) O₂(g) $\rarr$ 2CO₂(g) + H₂O(l) , $\Delta$ H ^$\circ$ _rxn= -1299 kJ/mol.Calculate the enthalpy of formation of acetylene, given the following enthalpies of formation
$\Delta$ H ^$\circ$ _f[CO₂(g) ] = -393.5 kJ/mol
$\Delta$ H ^$\circ$ _f[H₂O(l) ] = -285.8 kJ/mol

• A) 216 kJ/mol
• B) 226 kJ/mol
• C) 236 kJ/mol
• D) 246 kJ/mol
• E) None of the above

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