Chemistry-Covalent Bond
NEET Chemistry Covalent Bond MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the mean bond enthalpy for the O-H bond in water if the bond enthalpies for H2O(g) → H(g) + OH(g) and OH(g) → H(g) + O(g) are 502 kJ mol-1 and 427 kJ mol-1 respectively.
A
464.5 kJ mol-1
B
452.0 kJ mol-1
C
475.0 kJ mol-1
D
489.5 kJ mol-1
Correct Answer
Option A
Detailed Explanation
The mean bond enthalpy is calculated by averaging the bond enthalpies of the two steps: (502 + 427) / 2 = 464.5 kJ mol-1 as shown in the provided context.
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