Two gases in container

The above left is a container with a divider equally dividing hydrogen gas and oxygen gas at 00°C and 11 atm. Now, keeping the temperature of both gases at 00°C, the volume of the hydrogen gas is reduced by half by moving the divider to the left as shown in [B] above. Which of the following statements is correct about the states in [B]? (The molecular weight of an oxygen molecule is 1616 times as large as that of a hydrogen molecule.)

a) The pressure difference between the two gases is 1.51.5 atm.

b) The average kinetic energy of the hydrogen molecules is 1616 times as large as that of the oxygen molecules.

c) The average speed of the hydrogen molecules is 44 times as large as that of the oxygen molecules.

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