Determine the enthalpy change for air undergoing a process that causes a change of state from 300 K and 1 atm to 1000 K and 5 atms. Do this in two ways: (1) Assume ideal gas behavior and use Table C.2, and (2) use the NIST software, which incorporates real gas behavior. How do the two results compare? Why do the results differ? One objective of this problem is to acquaint you with ways to find the calorific properties of air.

 Table C.2

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T(K) 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 h (kJ/kg) 325.42 335.49 345.55 355.62 365.68 375.73 385.79 395.85 405.91 415.97 426.04 436.11 446.18 456.26 466.34 476.43 486.53 496.64 506.75 516.88 527.02 537.17 547.33 557.51 567.70 u (kJ/kg) 268.14 275.32 282.49 289.67 296.85 304.02 311.20 318.38 325.56 332.74 339.93 347.12 354.31 361.51 368.72 375.94 383.16 390.39 397.63 404.89 412.15 419.42 426.71 434.01 441.33 sº (kJ/kg-K) 3.4764 3.5255 3.5723 3.6171 3.6599 3.7009 3.7404 3.7783 3.8149 3.8502 3.8844 3.9174 3.9494 3.9804 4.0105 4.0397 4.0682 4.0959 4.1228 4.1491 4.1748 4.1999 4.2244 4.2483 4.2717 Cp (kJ/kg-K) 1.007 1.007 1.006 1.006 1.006 1.006 1.006 1.006 1.006 1.006 1.007 1.007 1.008 1.008 1.009 1.009 1.010 1.011 1.012 1.013 1.014 1.016 1.017 1.018 1.020 Cv (kJ/kg-K) 0.716 0.716 0.716 0.716 0.716 0.717 0.717 0.717 0.717 0.718 0.718 0.719 0.719 0.720 0.721 0.721 0.722 0.723 0.724 0.725 0.727 0.728 0.729 0.731 0.732 ?(=cp/ 1.406 1.405 1.405 1.404 1.404 1.404 1.403 1.403 1.403 1.402 1.402 1.401 1.401 1.400 1.400 1.399 1.399 1.398 1.398 1.397 1.396 1.395 1.395 1.394 1.393