As shown in the figure below, a cylinder fitted with a piston is filled with 400 lb of saturated liquid ammonia at 25°F. The piston weighs 1 ton and has a diameter of 2.5 ft. Patm = 1 atm Piston Weight = 1 ton D=2.5 ft Ammonia Saturated liquid What is the volume occupied by the ammonia, in ft³? Ignoring friction, determine the force required, in lbf, by mechanical attachments, such as stops, to hold the piston in place.

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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.