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JEE Main201912 Apr 2019Evening ShiftPhysicsKinetic Theory of GasesActual

A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process?

Options

  1. A40 J
  2. B35 J
  3. C25 J
  4. D30 J

Correct answer

B. 35 J

Step-by-step solution

C p = 7 2 R (for diatomic gas) Δ Q = n C p Δ T ∴ I s o b a r i c p r o c e s s Δ W = n R Δ T = 10 J Given ∴ Δ Q = n × 7 2 R Δ T = 7 2 × 10 = 35 J n R Δ T = 10 J

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