A sealed container of volume 7 m3 has two compartments with a barrier in between them.  In one compartment, there is O2 at an initial pressure of 3 atm, initial temperature of 540 K, and volume 3 m3.  In the other compartment, there is CO2 at an initial pressure of 5 atm, initial temperature of 430 K, and volume 4 m3.   The barrier in the middle is punctured and the two gases mix together.  What is the final pressure and temperature of the two gases?   Options: A) 4.08 atm, 452.42 K B) 3.87 atm, 429.13 K C) 4.08 atm, 476.35 K D) 3.87 atm, 452.42 K E) 4.37 atm, 484.58 K

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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.