A gas mixture consists of 1 kg of N2 and 1.5kg of He. Determine: Mass fractions (m) of: 1. N2: 2. He: Mole fractions (yi) of: 1. N2: 2. He: Heat transfer, in kj, required to increase the mixture temperature from 22 to 67 deg C, while keeping the pressure constant: Q= kj The change in entropy of the mixture for the process of heat transfer mentioned above:

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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.