A coal fire boiler plant consumes 400 kg of coal per hour. The boiler evaporates 3200 kg of water at 44.5 degrees * C into superheated steam at a pressure of 12 bar and 274.5 degrees * C . If the calorific value of fuel is 32760 kJ/kg of coal. Determine equivalent evaporation from and at 100 degrees *C and the thermal efficiency of the boiler. Assume specific heat of superheated steam as 2.1 kJ/kg.K.

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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.