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The Ideal Gas Law is one of the Equations of State. Although the law describes the behavior of an ideal gas, the equation is applicable to real gases under many conditions, so it is a useful equation to learn to use. The Ideal Gas Law may be expressed as: PV = NkT.
However, this more complete combined gas law is rarely discussed. Consequently, we will ignore it in future discussions and use only the law given in step 4 above. Example #1: This type of combined gas law problem (where everything goes to STP) is VERY common: 2.00 L of a gas is collected at 25.0 Â°C and 745.0 mmHg.