A gas has a temperature of 103 F (fahrenheit) and has a specific heat at a constant pressure of 0.28 Btu / lbm-F. Regardless of the pressure, cP increases 0.0005 btu for each degree increase in temperature. Assuming the gas is 1 pound. (A) calculate the enthalpy change if the temperature rises by 200 f (C)Find the heat and work that needs to be done to achieve the same enthalpy change.

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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.