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A tank used for filling helium balloons ...

A tank used for filling helium balloons has a volume of `0 .3 m^3` and contains (2.0) mol of helium gas at `20 .0^@ C`. Assuming that the helium behaves like an ideal gas.
(a) What is the total translational kinetic energy of the molecules of the gas ?
(b) What is the average kinetic energy per molecule ?

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