ThermochemistryHard

Question

Enthalpy change for the reaction,
4H(g) → 2H2 (g) is - 869.6 kJ
The dissociation energy of H - H bond is

Options

A.- 869.6 kJ
B.+ 434.8 kJ
C.+ 217.4 kJ
D.- 434.8 kJ

Solution

4H(g) → 2H2 (g) ; ᐃH = - 869.6 kJ
2H2(g) → 4H(g) ; ᐃH = 869.6 kJ
H2(g) → 2H(g) ; ᐃH = = 434.8 kJ

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