0.7 kg of R-134a with 50% quality is expanded at the constant pressure of 500 kPa until it is fully vaporized. From the stated condition: (1) (ii) (iii) (iv) Sketch the T-v diagram and include all the related information. Determine the change of the volume (m³) for the expansion Determine the change of the internal energy (kJ) during the expansion. Determine the change of enthalpy (kJ) for the expansion.

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Q: At 800 kpa pressure, the specific gravity 0.07N / liter liquid-vapor mixture

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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.