The enthalpy of formation of ethane () from ethylene by addition of hydrogen, where the bond-energies of , , , are 414 kJ, 347 kJ, 615 kJ and 435 kJ respectively, is kJ.

Question

The enthalpy of formation of ethane () from ethylene by addition of hydrogen, where the bond-energies of , , ,  are 414 kJ, 347 kJ, 615 kJ and 435 kJ respectively, is  kJ.

Canvas Classes · Accepted Answer

Strategy:
 The enthalpy of reaction can be calculated from bond energies as: .

Step 1: Identify bonds
Reaction: 
- Bonds to break: . (Note:  bonds remain mostly unchanged overall, but let's count for accuracy).
- Bonds to form: .

Step 2: Calculation

.

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