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PCAT Chemical Processes – Gas

The behavior of gas will deviate from ideal behaviors LEAST under which of the following sets of conditions:


  1. A gas at high pressure and temperature
  2. A gas at low pressure and temperature
  3. A gas at high pressure and low temperature
  4. A gas at low pressure and high temperature

The ideal gas law, PV=nRT, is based on two assumptions: 1) individual molecular volume is negligible, and 2) intermolecular forces do not exist. A real gas at high temperature and low-pressure conditions, best approximates these two assumptions, and thus the ideal gas law. Therefore, answer choice D is the correct answer.

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