2H2 + O2 ==> 2H2O
When working with gases one need not go through mols but may use volume directly.
Convert 200 L H2 to H2O using the coefficients in the balanced equation.
200 cc H2 x (2 mols H2O/2 mol H2) = 200 cc H2O
Convert 150 cc O2 to H2O.
150 cc O2 x (2 mols H2O/1 mol O2) = 3-- cc H2O.
You note that these numbers don't agree which means one of them is wrong. The correct value in limiting reagent problems (and this is a limiting reagent problem because amounts are given for BOTH reactants) is ALWAYS the smaller value. Therefore, you can produce 200 cc H2O this way.
Hydrogen burns to give water. If 200cm3 of H2 reacts with 150cm3 of O2 what volume of water vapor is produced
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