First slide

Enthalpy of Atomisation and bond dissociation

Question

Enthalpy change for the reaction
$4 H (g) \overset{}{\to} 2 H_{2} (g),$
is -869.6 kJ. The dissociation energy of H $—$ H bond is

Moderate

A

+217.4 kJ
B

-424.8 kJ
C

-869.6 kJ
D

+434.8 kJ

Solution

$2 H - H \overset{}{\to} 4 H; ΔΗ = + 869 .6 kJ$
$H - H \overset{}{\to} 2 H; ΔΗ = + 434.8 kJ$

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