The triple point of hydrogen occurs at a temperature of13.8 K and a pressure of 0.069 atm.(a) What is the vapor pressure of solid hydrogen at 13.8 K?(b) Suppose a sample of solid hydrogen is held under an     external pressure of 0.030 atm and heated from 5 to     300 K. What phase change(s), if any, will occur?

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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.