stoichiometry

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How many liters of H2 are required to react completely with 5.7 liters of O2?

• stoichiometry -

2H2 + O2 ==> 2H2O
When all gases are involved you can take a shortcut and NOT calculate mols. Use L directly.
5.7 L O2 x (2 mols H2/1 mol O2) = 5.7 x 2/1 = ?

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