The formation enthalpies, Hƒ for H(g) and O(g) are 220.0 and 250.0 kJ mol–1, respectively, at 298.15 K, and Hƒ for H2O(g) is –242.0 kJ mol–1 at the same temperature. The average bond enthalpy of the O

Question

The formation enthalpies, Hƒ for H(g) and O(g) are 220.0 and 250.0 kJ mol–1, respectively, at 298.15 K, and Hƒ for H2O(g) is –242.0 kJ mol–1 at the same temperature. The average bond enthalpy of the O–H bond in water at 298.15 K ____ kJ mol–1 (nearest integer).

Prashant Kotian · Accepted Answer

Correct answer: .. H2(g) + 1 2 O2(g) H2O(g) Hº = –242 kJ/mole 2H(g) O(g) H = 2 × 220 + 250 –2O–H = –242 2O–H = 2 × 220 + 250 + 250 = 932 O–H = 466 kJ/mole.

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