The formation enthalpies, Δ H f ^ for H (g) and O (g) are 220.0 and 250.0 kJ mol ⁻¹, respectively, at 298.15 K, and Δ H f ^ 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 is _ _ _ kJ mol ⁻¹ (nearest integer).

Chemical Thermodynamics: JEE Main 2025 Chemistry question

JEE Main 2025 · 28 Jan, Morning shift · Q72

JEE Main 202528 Jan, Morning shiftChemistryHardChemical Thermodynamics84× since 2002

The formation enthalpies,

\Delta H_f^\ominus

for

\mathrm{H_{(g)}}

and

\mathrm{O_{(g)}}

are 220.0 and 250.0 kJ mol

^{-1}

, respectively, at 298.15 K, and

\Delta H_f^\ominus

for

\mathrm{H_2O_{(g)}}

-242.0

kJ mol

^{-1}

at the same temperature. The average bond enthalpy of the O–H bond in water at 298.15 K is ______ kJ mol

^{-1}

(nearest integer).

Your answerType your answer. Integers and decimals are accepted.

JEE Main 2025 Chemical Thermodynamics Question with Solution (28 Jan Morning shift, Q72) | JEE Arc