Thermodynamics - Result Question 2

2. A sample of 0.1g of water at 100C and normal pressure (1.013×105Nm2) requires 54cal of heat energy to convert to steam at 100C. If the volume of the steam produced is 167.1cc, the change in internal energy of the sample, is

[2019]

(a) 104.3J

(b) 208.7J

(c) 84.5J

(d) 42.2J

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Answer:

Correct Answer: 2. (b)

Solution:

  1. (b) Using first law of thermodynamics equation, ΔQ=ΔU+ΔW

54×4.18 =ΔU+1.013×105(167.1×1060)

ΔU=208.7J



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