Question

a) When can a real gas behave as an ideal gas?

b) What happens to a real gas (e.g., nitrogen gas) as it cools from room temperature to 0 K, absolute zero? Would you expect it to “disappear” when it reached absolute zero? Explain your answer.

Answer 1

a) Real gases can be behave as an ideal gas only under the following condition that is Low pressure and high temparature.

When the pressure is reduced or decreased the volume of the gas is also reduced, then it leads to reduction in the intermolecular attraction forces present between the the molecules. As well as by increasing the T (temparature) also produces the similar effect like reduce the intermolecular forces among the molecules, because of incresed kinetic energy.

By this way and under these conditions real gas can behave as an ideal gas.

b) When a real gas cools from room temparature to O K (-273.15 C) some gas may form into solid and there would be no gas in little amount also, why because above -273.15 C all the gases have their melting points so at O K gas will condence to liquid from gas phase.