Posted by g on Monday, February 18, 2013 at 11:10pm.
Write the equation and balance it.
mols H2 = grams/molar mass
mols O2 = grams/molar mass
Convert mols H2 to mols product.
Do the same for O2.
The smaller number of mols wins; that will be the mols H2O produced. Then mol x molar mass H2O = grams H2O.
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