A medical ampoule containing 10 MPa, dextrose (liquid water) at 155(°c)and 0.5∙10-5 m3 in volume is placed in a 0.03 m3 volume cylinder. A vacuum is created in the cylinder and the capsule ruptures. Then the dextrose fills the cylinder and begins to evaporate. Calculate the final quality of the water-vapor mixture in the cylinder when it reaches the final equilibrium temperature of 35 oC. Also, calculate the heat transfer with the environment.

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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.