Heat and Thermodynamics 1 Question 17

17. 70cal of heat are required to raise the temperature of 2 moles of an ideal diatomic gas at constant pressure from 30C to 35C. The amount of heat required (in calorie) to raise the temperature of the same gas through the same range (30C to 35C ) at constant volume is

(1985,2M)

(a) 30

(b) 50

(c) 70

(d) 90

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Answer:

Correct Answer: 17. (b)

Solution:

  1. Q1=nCpΔT,Q2=nCVΔT,Q2Q1=CVCp=1γ

 or Q2=Q1γ=701.4=50cal



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