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Question

15 gm N2 is present in a closed container at 300 K. The amount of heat supplied to the system so that Vrms becomes double is :
  1. 8 kJ
  2. 10 kJ
  3. 12 kJ
  4. 14 kJ


Solution

The correct options are
B 10 kJ
Vrms=3RTMVrmsT

To double the Vrms Temp must be 4 times of the initial temperature

T2=4×300=1200 K

Heat added = n Cv dT

=1528×52×8.314×(1200300)

10021.3 J=10 kJ

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