Calculate the pressure of vapor at a temperature of 500°C and a density of 24 kg/m3 using (a) the ideal gas equation, (b) the van der Waals equation, (c) the compressibility factor. Note that the pressure is equal to P= 8000 kpa and find the percentage of error between the three laws

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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.