A piston cylinder device contains 10 L of nitrogen at 10 MPa and 200 K. It is

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A piston cylinder device contains 10 L of nitrogen at 10 MPa and 200 K. It is heated at a constant pressure to a temperature of 400 K. Determine
(a) ΔH.
(b) ΔS. Use the RG model with Lee-Kesler charts.
(c) What-if Scenario: What would the answers be if the PC model were used? If the PC model is always more accurate, then why should anyone use the RG model at all?
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