If the volume of 10 kg gas (cp = 0.92 KJ/kg-K) increases to three times the original volume, its entropy change in KJ/kg-K is: A. 10.11      B. 8.34             C. 12.41           D. 32.34

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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.