TOPIC: PROPERTIES OF SUBSTANCES: Note: The pressure values are absolute values unless specified. Determine the properties of H2O with units according to the following Table: Sketch of location of point in TS diagram below using P, T and x lines as applicable CONDITIONS: 1. Liquid at P = 20 Mpa and T= 190 C 2. Saturated liquid at T = 223.75 deg C 3. Steam with quality of 90 % at P = 6.7 Mpa 4. Dry steam at P = 18.05 Mpa 5. Steam at T =167 C, moisture = 3% 6. Steam with P = 3.42 Mpa and T = 460 C 7. Steam at 17.398675 Mpa gage, T=454.75 C 8. Steam at P = 17.0 Mpa, deg SH = 60 C 9. Saturated vapor at 40 bars 10. Boiling Point of H2O in deg Celsius at atmospheric pressure of 0.19 Mpa ANSWERS: h = V= U= S= h = U= S= h = U= S= h = U= V= U= V= h = S= T boiling point = in a p

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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.