Determine the reduced temperature of superheated water vapor at 16.64 MPa and 356.22 C, using the generalized compressibility chart. Assume that the compressibility factor is 0.66. R = 0.4615 kPa·m3/kg·K Tcr = 647.1 K Pcr = 22.06 MPa

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.