10. Calculate the latent heat of vaporization of ammonia at 40°C using the following data from the saturation table of ammonia. t(°C) 30 35 40 45 50 p(bar) 11.67 13.5 15.54 17.82 20.33 v₁(kg 1.68 1.7 1.73 1.75 1.78 v₂ kg 0.11 0.095 0.083 0.073 0.063

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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.