The molar kinetic energy of a gas is directly proportional to its temperature. At the same temperature, all gases have the same average kinetic energy. However, chlorine gas has a higher molar mass than nitrogen gas. This means that each molecule of chlorine gas has a higher mass than each molecule of nitrogen gas. Therefore, the chlorine gas molecules have a lower average velocity than the nitrogen gas molecules. The lower average velocity of the chlorine gas molecules results in a lower molar kinetic energy for chlorine gas compared to nitrogen gas.
