In a house, room temperatures are desired to be kept constant at 21 ° C. For this purpose, the temperature of the water entering the radiator with a flow rate of 5 kg / min is initially 90 ° C (saturated liquid), but drops to 70 ° C at the radiator outlet. According to this; a) entropy change of water b) The entropy change of the room c) Calculate the total entropy 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.