An insulated rigid tank is divided into two compartments by a partition. One compartment contains 8 kg of oxygen gas at 42 ∘C and 100 kPa, and the other compartment contains 4 kg of nitrogen gas at 20 ∘C and 180 kPa. The partition is then removed and the two gases are allowed to mix.   Part A Determine the mixture temperature after equilibrium has been reached. Express your answer to four significant figures. Part B Determine the mixture pressure after equilibrium has been reached. Express your answer to five significant figures and include the appropriate units.

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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.