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SSC CGL 2023 PYQ — Question 125

SSC CGL Tier II - 26 October 2023 • General Awareness • Q125

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What will be the average kinetic energy per molecule in SI units for an ideal gas at a temperature of 25°C?

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Correct answer: B

Explanation

The correct answer is option 2 i.e.  6.17×10−216.17 × 10^{−21} J.

The average kinetic energy per molecule of an ideal gas can be calculated using the formula:

(KE= 3/2KBT)

where KB is the Boltzmann constant (1.38×10-23 J/K) and T is the temperature in Kelvin. For 25°C (298 K):

KE= 3/2 * 1.38 × 10-23 J/K * 298K = 6.17 × 10−21 J