Determine the specific heat capacities at constant volume and constant pressure for nitrogen, given that its molecular weight is 28 and the adiabatic index for expansion and compression is 1.4. The universal gas constant is 8314 Jmol-1K-1.  Explain the difference in the values for the two specific heat capacities.

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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.