Chemistry-Covalent Bond
NEET Chemistry Covalent Bond MCQ Question
Type: MCQ-numerical-Hard-Class 11
Calculate the average bond enthalpy of the O-H bonds in water using the given bond dissociation enthalpies.
A
464.5 kJ mol⁻¹
B
500 kJ mol⁻¹
C
450 kJ mol⁻¹
D
475 kJ mol⁻¹
Correct Answer
Option A
Detailed Explanation
The average bond enthalpy is calculated by taking the sum of the bond dissociation enthalpies of the O-H bonds (502 kJ mol⁻¹ and 427 kJ mol⁻¹) and dividing by the number of bonds, which is 2: (502 + 427) / 2 = 464.5 kJ mol⁻¹.
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