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JEE Main201910 Apr 2019Morning ShiftPhysicsThermodynamicsActual

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 m o l - 1 K - 1 ]

Options

  1. A748 J
  2. B700 J
  3. C350 J
  4. D374 J

Correct answer

A. 748 J

Step-by-step solution

The amount of heat supplied is Q = n C V Δ T = 67.2 22.4 3 R 2 20 = 3 × 3 2 × 8.314 × 20 = 748   J

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