A cylinder with fixed capacity of 67.2 litre contains helium gas at STP. The amount of heat needed to raise…

A cylinder with fixed capacity of 67.2 litre contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by 20°C is:
[Given that R=8.31 J mol-1 K-1]
  1. 748 J
  2. 700 J
  3. 350 J
  4. 374 J

Solution

The amount of heat supplied is
Q=nCVΔT
=67.222.43R220
=3×32×8.314×20
=748 J

Asked in: JEE Main 2019 (10 Apr Shift 1)

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