Question

Under which set of conditions will the ideal gas law give the best approximation for the properties of a real gas?
Select the correct answer below:
low pressure and low temperature
low pressure and high temperature
high pressure and low temperature
high pressure and high temperature

Answer 1

For a real gas to approach the properties of an ideal gas, the pressure should be low, the attraction between the molecules should be high, and temperature should be high.

Ideal gas conditions are:

• An ideal gas is a gas that has no intermolecular attraction.
• An ideal gas is a gas with negligible volume.
• The ideal gas equation is

         PV =nRT

The real gas conditions are:

• A real gas is a gas that has an intermolecular attraction.
• A real gas is a gas that has volume.
• The real gas equation is

       (P +αn²) (V - nb) = nRT

             V²

Thus, real gases behave ideally at high temperatures and low pressures.

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