# Stoichiometric Calculations  This article by Pearson Education Inc. focuses on stoichiometric calculations, which involve using the coefficients in a balanced chemical equation to determine the mole ratios of reactants and products. Starting with the mass of

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PowerPoint presentation about 'Stoichiometric Calculations'. This presentation describes the topic on This article by Pearson Education Inc. focuses on stoichiometric calculations, which involve using the coefficients in a balanced chemical equation to determine the mole ratios of reactants and products. Starting with the mass of. The key topics included in this slideshow are . Download this presentation absolutely free.

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Slide1© 2012 Pearson Education, Inc.Stoichiometric Calculations The coefficients in the balanced equation give the ratio of  moles  of reactants and products.

Slide2© 2012 Pearson Education, Inc.Stoichiometric Calculations Starting with the mass of Substance A, you can use the ratio of the coefficients of A and B to calculate the mass of Substance B formed (if it’s a product) or used (if it’s a reactant).

Slide3© 2012 Pearson Education, Inc.Stoichiometric Calculations Starting with 1.00 g of C 6 H 12 O 6 … we calculate the moles of C 6 H 12 O 6 … use the coefficients to find the moles of H 2 O… and then turn the moles of water to grams. C 6 H 12 O 6  + 6 O 2     6 CO 2  + 6 H 2 O

Slide4© 2012 Pearson Education, Inc.Limiting Reactants

Slide5© 2012 Pearson Education, Inc.Limiting Reactants • The  limiting reactant  is the reactant present in the smallest stoichiometric amount. – In other words, it’s the reactant you’ll run out of first (in this case, the H 2 ).

Slide6© 2012 Pearson Education, Inc.Limiting Reactants In the example below, the O 2  would be the excess reagent .

Slide7© 2012 Pearson Education, Inc.Theoretical Yield • The  theoretical yield  is the maximum amount of product that can be made. – In other words, it’s the amount of product possible as calculated through the stoichiometry problem. • This is different from the  actual yield,  which is the amount one actually produces and measures.

Slide8© 2012 Pearson Education, Inc.Percent Yield One finds the  percent yield  by comparing the amount actually obtained (actual yield) to the amount it was possible to make (theoretical yield): Percent yield = x 100 actual yield theoretical yield