A tank contains one kilogram of water consisting of liquid and vapor in equilibrium at 1 MPa. If the mixture in the tank contains one-third and the remaining is vapor of the volume of the tank, what the enthalpy of the mixture in the tank? a) 644.40 kJ/kg b) 774.40 kJ/kg c) 785.92 kJ/kg d) 435.29 kJ/kg

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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.