BalancedEQs

# BalancedEQs - • determines how much of the product can...

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quantitative information  - available from the coefficients of a balanced equation   coefficients represent the relative number of molecules/moles of the substance o 2H2O same as 2 molecules of water, or 2 moles of water substances in a balanced equation are stoichiometrically equivalent use dimensional analysis to predict amount of products/reactants o In the chemical equation 2H2 + O2 >> H2O, how many moles of water can be created from 4 moles of hydrogen? o 4 mol H2 x 1 mol H2O / 2 mol H2 = 2 mol H2O combinations of conversion factors can be used to predict amount of products/reactants when given known masses and a balanced equation o How much water can be made from 23.1 grams of hydrogen? o 23.1 g x 1 mol H2 / 2.01588 g x 1 mol H2O / 2 mol H2 x 18.01528 g = 103 g H2O limiting reactant  - restricts how much of the excess substance can be used
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Unformatted text preview: • determines how much of the product can possibly form o When given 23.1 grams of hydrogen and 25.4 grams of oxygen, how much water can be produced? o 23.1 g x 1 mol H2 / 2.01588 g x 1 mol H2O / 2 mol H2 x 18.01528 g = 103 g H2O o 25.4 g x 1 mol O2 / 31.9988 g x 1 mol H2O / 1 mol O2 x 18.01528 g = 14.3 g H2O o oxygen, the limiting reactant, would produce less water product than hydrogen o no more than 14.3 grams of water can be made from the reactants given • theoretical yield- quantity of product predicted to form if all the limiting reactant is used • percent yield- actual yield divided by theoretical yield o What is the percent yield if 12.5 g of water was produced from 23.1 g of hydrogen and 25.4 g of oxygen? (see above) o 12.5 / 14.3 = 0.874 = 87.4%...
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