3 An unknown gas at p, = 95 psia and V, = 4 ft³ undergoes a process that results in p,15 psia and V,= 16.56 ft', during which the enthalpy decreases to 83 Btu and c = 0.1573 Btu/lb- Determine (a) AU, (b) c, and (c) R. Jans: AU = -58.65 Btu; c, = 0.2226 Btu/lb-°R; R= 50.81 ft-lb,/lb--°R] -°R. %3D %3D

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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.