Problem: 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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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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