Thermodynamics Question 239

Question: 4 kg of oxygen gas is heated so as to raise its temperature from 20 to120C . If the heating is done at constant pressure, the external work done by the gas is (Cp=0.219cal/gC and )

Options:

A) 628 kJ

B) 104 kJ

C) 366 kJ

D) 206 kJ

Show Answer

Answer:

Correct Answer: B

Solution:

[b] W=P(ΔV)P(VγΔT)

=105×(5×102)3×3.5×105×375=0.164J

=4(0.2190.157)×4200×(12020)

=104×103J



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