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Percent error is used when you are comparing your result to a known  or accepted value. It is the absolute value of the difference of  the values divided by the accepted valâ¦ue, and written as a  percentage. Percent error is equal to the difference divided by the  known times 100 percent.
Calculate the yield of each reactant. To review, follow the strategy outlined in How to Calculate Theoretical Yield. The mole ratios between each reactant and the product is needed to complete the calculation: The mole ratio between H 2 and H 2 O is 1 mol H 2 /1 mol H 2 O.The mole ratio between O 2 and H 2 O is 1 mol O 2 /2 mol H 2 O. The molar masses of each reactant and product are also needed.uch more water is formed from 20 grams of H 2 than 96 grams of O 2. Oxygen is the limiting reactant. After 108 grams of H 2 O forms, the reaction stops. To determine the amount of excess H 2 remaining, calculate how much H 2 is needed to produce 108 grams of H 2 O.