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Question 31016
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Kinetic Theory and Thermodynamics: Speeds MCQ

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SpeedsHardQuestion 31016

Question

At temperature T, average kinetic energy of nitrogen molecule (M = 28 g/mol, R = 8.314 J/mol·K) at 300 K is:
  1. A
    6.2×10⁻²¹ J
    Correct
  2. B
    6.2×10⁻²³ J
  3. C
    6.2×10⁻²⁵ J
  4. D
    4.1×10⁻²¹ J

Correct answer

6.2×10⁻²¹ J

Explanation

KE = (3/2)kT = 1.5 × 1.38×10⁻²³ × 300 = 6.21×10⁻²¹ J.

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