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GK QUESTION#3046

What is the average translational kinetic energy per molecule of an ideal gas at 25 °C?

  1. A9.17 × 10⁻²² J
  2. B6.17 × 10⁻²¹ JCorrect answer
  3. C7.17 × 10⁻²⁰ J
  4. D8.17 × 10⁻²² J
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Answer

B. 6.17 × 10⁻²¹ J

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Explanation

The mean translational kinetic energy per ideal-gas molecule is 3kBT/2. At 25 °C, T = 298.15 K. Using kB = 1.380649 × 10⁻²³ J/K gives approximately 6.17 × 10⁻²¹ J. Internal rotational or vibrational energy is not included in this translational result.

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