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A mixture containing 1.12 litre of H^2 a...

A mixture containing 1.12 litre of `H^2` and 1.12 litre of `D^2` (deuterium) at STP is taken inside a bulb connected to another bulb by a stop-cock wilh a small opening. The second bulb is fully evacuated, the stop-cock is opened for a certain time and then closed. The first bulb is found to contain 0.05 g of `H^2`. Determine the percentage composition by mass of the gases in the second bulb.

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