Heat and Thermodynamics 6 Question 5

9. Two moles of ideal helium gas are in a rubber balloon at 30C. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35C. The amount of heat required in raising the temperature is nearly (take R=8.31J/molK)

(a) 62J

(b) 104J

(c) 124J

(d) 208J

(2012)

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Answer:

Correct Answer: 9. (none)

Solution:

  1. The process may be assumed to be isobaric.

Q=nCpΔT=(2)(52R)(5)=5×8.31×5=207.75J208J



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