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Question

The most probable speed of 8 g of H2 is 200 ms1. The average kinetic energy (neglect rotational and vibrational energy) of H2 gas is:
  1. None of these
  2. 240 J
  3. 120 J
  4. 480 J


Solution

The correct option is B 240 J
The value of most probable speed is 2RTM, when speed is in ms1 and molar mass (M) of gas is taken in Kg/mol.
According to the question:
200=2RT2×103
RT=40
Average Kinetic energy (K.E.) for one mol of gas particles  =32nRT=32×82×40
=240 J

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