A gas mixture contains 3.00 atm of H2 and 1.00 atm of O2 in a 1.00 L vessel at 400K. If the mixture burns to form water while the temperature is held at 400K, what is the partial pressure of H2O

Explanation:

Hello!

In this case, according to the following chemical reaction:

It means that we need to compute the moles of hydrogen and oxygen that are reacting, via the ideal gas equation as we know the volume, pressure and temperature:

Thus, the yielded moles of water are computed by firstly identifying the limiting reactant:

Thus, the fewest moles of water are 0.0609 mol so the limiting reactant is oxygen; in such a way, by using the ideal gas equation once again, we compute the pressure of water:

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