ThermochemistryHard

Question

Heat absorbed in the reaction H2(g) + Cl2(g) → 2HCl(g) is 182 kJ. Bond energies of H–H = 430 kJ/mole and Cl–Cl = 242 kJ/mole. The H–Cl bond energy is

Options

A.763 kJ/mole
B.245 kJ/mole
C.336 kJ/mole
D.154 kJ/mole

Solution

$+ 182 = (430 + 242) - \left( 2 \times B.E._{H - Cl} \right)$

$\therefore B.E._{H - Cl} = 245\text{ kJ/mol}$

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