Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C₂H₂, burns in excess oxygen to yield carbon dioxide and water vapor at 25°C. BE(C-C) = 347 kJ/mol
BE(C $\equiv$ C) = 812 kJ/mol
BE(C=O in CO₂) = 799 kJ/mol
BE(C-H) = 414 kJ/mol
BE(O-H) = 460 kJ/mol
BE(O=O) = 498.7 kJ/mol

Question

Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C₂H₂, burns in excess oxygen to yield carbon dioxide and water vapor at 25°C. BE(C-C) = 347 kJ/mol
BE(C

\equiv

C) = 812 kJ/mol
BE(C=O in CO₂) = 799 kJ/mol
BE(C-H) = 414 kJ/mol
BE(O-H) = 460 kJ/mol
BE(O=O) = 498.7 kJ/mol

Quizplus · Accepted Answer

To estimate the heat released, calculate the total bond enthalpies of reactants and products. For C2H2, break 1 C≡C and 2 C-H bonds. For O2, break 2 O=O bonds. For CO2 and H2O, form 4 C=O and 2 O-H bonds. The difference gives the heat released.

Use the Bond Enthalpy Data Given to Estimate the Heat ≡\equiv≡

Use the Bond Enthalpy Data Given to Estimate the Heat $\equiv$