The Bond energy of C=C, C-C, C-H and H-H are 147, 83, 99 and 104 kcal/mol respectively then calculate heat of hydrogen of ethene.

Explanation

To calculate the heat of hydrogenation of ethene (C2H4), we will follow these steps:

### Step 1: Identify the bonds in the reactants and products
- **Reactants**: Ethene (C2H4) and Hydrogen (H2)
- Ethene has:
- 1 C=C bond
- 4 C-H bonds
- Hydrogen has:
...