temperature, and discuss the results. 3-84 Determine the specific volume of superheated water vapor at 3.5 MPa and 450°C based on (a) the ideal-gas equation, (b) the generalized compressibility chart, and (c) the steam tables. Determine the error involved in the first two cases. 3-85 Somebody claims that oxygen gas at 160 K and 3 MPa can be treated as an ideal gas with an error of less