Consider a short time span just before and afterthe spark plug in a gasoline engine ignites the fuel-air mixture andreleases 1970 J of thermal energy into a volume of 47.6 cm3thatis at a gas pressure of 1.17 * 106 Pa. In this short period of timethe volume of the gas can be considered constant. (a) Treating thefuel-air mixture as a monatomic ideal gas at an initial temperatureof 325 K, what is its temperature after ignition? (b) What is thepressure in the gas after ignition?

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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.