helium will have the greatest kinetic energy at room temperature.
According to Kinetic theory of gases, an increase in temperature of the gases will increase the average kinetic energy of the gas molecules, while a decrease in the temperature of the gases will cause a decrease in the average kinetic energy of the gases.
The average kinetic energy of the gas molecules increases with increase in temperature. Temperature is simply the measure of average kinetic energy of gas molecules.
At room temperature gases have the highest kinetic energy, followed by liquid, and the least is solid.
A among the gases, methane is more dense than helium and consequently it will have low kinetic energy.
Thus, helium will have the greatest kinetic energy at room temperature.
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