Problem 8( Nitrogen gas at constant pipeline conditions of 200 kPa and 300 K passes slowly through a valve into a well-insulated, frictionless, and initially evacuated piston-cylinder assembly. A pressure of 150 kPa in the cylinder is needed to support the piston due to its own weight and the ambient atmosphere. The volume under the piston is 1 m³ at the end of the process. Find (a) the boundary work done during this process, (b) the final temperature of the nitrogen in the cylinder, and (c) the mass that enters the cylinder during the process. m.h

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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.