Question

Under what condition would the distance between the molecles of oxygen gas increase

Answer 1

When the gas molecules are subject to higher temperature and lower pressure. With higher temperature the kinetic energy of the molecules is increased resulting in their tendency to move far, also at lower pressure the molecules are have less intermolecular attractions.

Note : Lower pressure and higher temperature are considered in reference to their critical pressure and critical temperature.

Answer 2

when we heat them at high temprature at low pressure the distance increases