A perfect gas mixture consists of 4 kg of N2 and 6 kg of CO2 at a pressure of 4 bar and a temperature of 25°C. For N2; Cv=0.745 kJ/kg K and Cp=1.041 kJ/kg K. For CO2; Cv=0.653 kJ/kg K and Cp=0.842 kJ/kg. Find Cp, Cv and R of the mixture. If the mixture is heated at constant volume to 500C, find the changes in internal energy, enthalpy and entropy of the mixture.

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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.