Q.6 A certain amount of an ideal gas is initially at a pressure P, and temperature T. 1' First, it undergoes a constant pressure process 1-2 such that T, = 3T,/4. Then, it 2 undergoes a constant volume process 2-3 such that T2=T,/2. The ratio of the final %3D volume to the initial volume of the ideal gas is A 0.25 В 0.75 C 1.0

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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.