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The total pressure of a mixture of H(2) ...

The total pressure of a mixture of `H_(2) and O_(2)` is 1.00 bar. The mixture is allowed to react to form water which is completely removed to leave only pure `H_(2)` at a pressure of 0.35 bar . Assuming ideal behaviour and that all pressure measurements were made under the same conditions of temperature and volume. The mole fraction of `H_(2)` in the original mixture is

A

0.78

B

0.28

C

0.22

D

0.72

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A
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