In a well-insulated fixed-volume closed vessel, there is initially 5 kg of saturated liquid-vapour mixture water at 100 kPa pressure. In this state, one quarter of the total mass is in the vapor phase. Then, the electric heater in the container operates and a current of 8 A flows through the heater plugged into a 110 V outlet. How long will it take to evaporate all the liquid in the container? Plot the phase change in the T-v diagram showing the saturation curves.

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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.