An adiabatic drier is used to dry pasta at 101.3 kPa. 90 m3 of ambient air having 48% RH is heated to 90°C. The heated air at 90°C with a dew point of 25°C enters to the drier. Determine necessary amount of heat required to heat the air before entering the drier. After drying, measurements show that 1.5 kg of water is evaporated from pasta. Determine dry-bulb temperature of the exit air from drier.

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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.