Two vessels, A and B, both containing nitrogen, are connected by a valve which is opened to allow the contents to mix and achieved an equilibrium temperature of 27 °C. Before mixing the following information is known about the gases in the vessels. Vessel A P=1.5 Mpa T=50 °C Contents=0.5 kg mol Vessel B P= 0.6 Mpa T=20 °C Contents=2.5 kg Calculate: A the final equilibrium pressure B. the amount of heat transferred to the surroundings. C. Take n=1.4

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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.