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A container of fixed volume has a mixture of one mol of hydrogen and mol of helium in equilibrium at temperature T. Assuming the gases are ideal, the correct statement(s) is/are:
A) the average energy per mol of the gas mixture is 2RT
B) the ratio of speed of sound in the gas mixture to that in helium gas is SQRT(6/5)
C) the ratio of the RMS speed of He to H2 molecule is ½
D) the ratio of the RMS speed of He to H2 molecule is 1/SQRT(2).

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