Question
Enthalpy change for the reaction,
4H (g) → 2H2 (g) is - 869.6 kJ
The dissociation energy of H - H bond is
-
-869.6 kJ
-
+434.8 kJ
-
+217.4 kJ
-
-434.8 kJ
Solution
B.
+434.8 kJ
4H (g) → 2H2 (g); ΔH = - 869.6 kJ
2H2 (g) → 4 H (g); ΔH = 869.6 kJ
H2 (g) → 2 H (g); ΔH = 869.6/2 = 434.8 kJ
