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Question

Calculate Hor for the reaction CH2Cl2(g)C(g)+2H(g)+2Cl(g).
The average bond enthalpies of C - H and C - Cl bonds are 414 kJmol1 and 330 kJ mol1.

A
1488 kJ mol1
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B
1468 kJ mol1
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C
1478 kJ mol1
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D
1498 kJ mol1
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Solution

The correct option is A 1488 kJ mol1
We are given
εCH=414 kJ mol1
εCCl=330 kJ mol1

We know
ΔrH=(Bond Energy)reactants(Bond Energy)products
Here the bond energy of products won't be taken into account as the products doesn't contain any bonds.
So,
Hr=2εCH+2εCCl
putting the values,
=2×414+2×330
=828+660=1488 kJ/mol.
hence, Hr=1488 kJ/mol.

Theory:

Determination of enthalpy of reaction:
ΔrH=(Bond Energy)reactants(Bond Energy)products

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