Thermodynamics problem- isobaric process

  • Thread starter mrdith007
  • Start date
  • #1
mrdith007
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Homework Statement




One mole of an ideal monatomic gas is taken through the cycle ABCA shown schematically
in the diagram. State A has volume 0.0208 m3 and pressure 1.22 × 10 5 Pa, and state C has volume 0.0524 m3 Process CA lies along the 305 ±1 K isotherm. The molar heat capacities for the gas are 20.8 J/mol · K and 12.5 J/mol · K.

Determine the heat Qab added to the gas during process AB.
Answer in units of J

I have attached an image with the graph. I am not sure if it is necessary. I got the correct answer to the first question (the new temp = 768.365 K)

Homework Equations



W = p[tex]\Delta[/tex]V
Q = [tex]\Delta[/tex]U + W

The Attempt at a Solution



I do not know how to calculate the U, which I think I need

Homework Statement





Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
gamma5772
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[tex] \Delta U = C_V \Delta T[/tex] for an ideal gas.
 

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