Given only partial pressure of hydrogen and oxygen, and volume, can you know which is the limiting reactant?

Question

i don't know how to answer this, some one please help thanx very much

Answer 1

assuming the reaction is combution, no. You also need to know the substance which is being combusted.

Answer 2

Will have to make some assumptions, Partial pressure is propionate to the volumes and volumes are same.

If both are of same volume then hydrogen will be the limiting reactant. As it will vanish to form Water and some oxygen will still remain. Any reactant which vanishes completely after the reaction is called the limiting reactant.
So in here H2O needs 2 molecules of hydrogen and 1 molecule of oxygen. If both are in same volume then hydrogen will be used double than oxygen.

If conditions are different then depending on the volume we can guess what the limiting reactant will be

Answer 3

Yes, because the partial pressures must also be in the ratio 2:1 to react properly, to make steam. If, say, the ratio was 3:1, there would be excess hydrogen, and oxygen would be the limiting reagent.