Estimate the heat released when ethene (CH2 = CH2) reacts with HBr to give CH3CH2Br. Bond enthalpies are
C - H : 412 kJ/mol; C - C : 348 kJ/mol;
C = C : 612 kJ/mol; C - Br : 276 kJ/mol;
Br - Br : 193 kJ/mol; H - Br : 366 kJ/mol.
1. 58 kJ/mol
2. 1036 kJ/mol
3. 424 kJ/mol
4. 200 kJ/mol
5. 470 kJ/mol
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