AIPMT MAINS2009Chemistry-Thermodynamics
AIPMT MAINS 2009 Chemistry Energy Calculations MCQ Question
Type: MCQ-numerical-Medium-Class 11
The energy absorbed by each molecule (A₂) of a substance is 4.4 × 10⁻¹⁹ J and bond energy per molecule is 4.0 × 10⁻¹⁹ J. The kinetic energy of the molecule per atom will be:
A
2.2 × 10⁻¹⁹ J
B
2.0 × 10⁻¹⁹ J
C
4.0 × 10⁻²⁰ J
D
2.0 × 10⁻²⁰ J
Correct Answer
Option D
Detailed Explanation
The excess energy after breaking the bond is converted into kinetic energy. The kinetic energy per molecule is (4.4 - 4.0) × 10⁻¹⁹ J = 0.4 × 10⁻¹⁹ J. Since the molecule A₂ splits into two atoms, the kinetic energy per atom is 0.4 × 10⁻¹⁹ J / 2 = 2.0 × 10⁻²⁰ J.
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