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Initially, the root-mean-square (RMS) velocity of N 2 molecules at certain temperature is u . If this temperature is doubled and all the nitrogen molecules dissociate into nitrogen atoms, then the new RMS velocity will be:

Options

  1. A2   u
  2. B14   u
  3. C4   u
  4. Du / 2

Correct answer

A. 2   u

Step-by-step solution

u = 3 RT 28 u ′ = 3 R × 2 T 14 u u ′ = 1 4 u u ′ = 1 2 u ′ = 2 u

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