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Assuming that only the listed gases are present, what would be the mole fraction of oxygen...

Assuming that only the listed gases are present, what would be the mole fraction of oxygen gas be for the following situation? A gas sample of 2.31 atm of oxygen gas and 3.75 atm of hydrogen gas that reacts to form water vapor. Assume the volume of the container and the temperature inside the container does not change.

The answer I keep coming up with is 0.379 ratio of O2, which apparently is incorrect. Please help me solve this problem!

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