AIPMT MAINS2009Chemistry-Thermochemistry
AIPMT MAINS 2009 Chemistry Bond Energies MCQ Question
Type: MCQ-numerical-Hard-Class 11
From the following bond energies: H – H bond energy: 431.37 kJ mol⁻¹ C = C bond energy: 606.10 kJ mol⁻¹ C – C bond energy: 336.49 kJ mol⁻¹ C – H bond energy: 410.50 kJ mol⁻¹ Enthalpy for the reaction, H₂C = CH₂ + H₂ → H₃C – CH₃ will be:
A
-243.6 kJ mol⁻¹
B
-120.0 kJ mol⁻¹
C
-553.0 kJ mol⁻¹
D
-1523.6 kJ mol⁻¹
Correct Answer
Option B
Detailed Explanation
The enthalpy change is calculated using bond energies: ΔH = Σ(bond energies of reactants) - Σ(bond energies of products). The calculated value i.0 kJ mol⁻¹.
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