Question

under what condition of temperature and pressure real gases tend to behave ideally

Answer 1

at high temperature and low pressure. hope it helps

Answer 2

The conditions in which 'Real' gases tend to behave ideally are a higher temperature and a lower pressure.

• Under certain conditions of a higher temperature and a low pressure around standard temperature and pressure, many 'real' gases exhibit the behavior of an ideal gas qualitatively.
• IUPAC defines that the standard temperature and pressure (STP) denotes an absolute pressure of exactly 105 pascals and a temperature of 273.15 kelvin.
• Some light gases, such as hydrogen, nitrogen, oxygen, and noble gases; some heavier gases, like carbon dioxide and air, can behave as ideal gases considering reasonable tolerance over ranges around standard temperature and pressure.
• The concept of an ideal gas is theoretical, and here we assume that the randomly moving point particles of the 'ideal' gas are not subject to interparticle interactions.
• The interparticle interactions owe their existence to the intermolecular force between the constituent molecules.
• In the ideal gas concept, the gas molecules (or atoms for monatomic gas) behave like the 'ideal' particles.
• At a higher temperature and a lower pressure, the intermolecular forces contribute to the potential energy of the gas particles less significantly (in comparison to their kinetic energy.)
• Also, at a higher temperature and a lower pressure, the size of the gas molecules (or atoms for monatomic gas) becomes less significant (in comparison to the 'empty' space between them.)
• The volume of one mole of an ideal gas is 22.710947 liters at standard temperature and pressure.
• The ideal gas model is not valid at lower temperatures or higher pressures because the intermolecular forces and molecular size become prevalent, unlike the conditions at a higher temperature and a lower pressure.
• 'Real' gas at a high pressure exhibits a considerably larger volume than an 'ideal' gas.
• 'Real' gas at a low temperature exhibits a considerably lesser pressure than an ideal gas.
• It may even happen that at some point of a low temperature and a high pressure, a 'real' gas undergoes a phase transition (gas to a liquid or a solid.)
• The ideal gas model is strict enough to allow a phase transition.
• Thus, a gas generally behaves more like an ideal gas at a higher temperature and lower pressure.

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