Chapter 9 - Stoichiometry

25 July 2022
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Composition Stoichiometry
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calculations involving the mass relationships of elements in compounds
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Reaction Stoichiometry
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calculations involving the mass relationships between reactants and products in a chemical reaction
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Mole Ratio
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a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction
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Stoichiometry
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(chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)
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Limiting Reactant
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the reactant that limits the amounts of the other reactants that can combine and the amount of product that can form in a chemical reaction
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Excess Reactant
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the substance that is not used up completely in a reaction
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Percentage Yield
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the ratio of the actual yield to the theoretical yield multiplied by 100
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Actual Yield
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the amount of product that actually forms when the reaction is carried out in the laboratory
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Theoretical Yield
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the amount of product that could form during a reaction calculated from a balanced chemical equation; it represents the maximum amount of product that could be formed from a given amount of reactant
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Given the Balanced Reaction: 2Al2O3(l) → 4Al(s) + 3O2(g) How many moles of O2 will be formed if 10 moles of Al2O3 are used?
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15 moles of O2
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Given the reaction: NH3(g) + O2(g) → NO(g) + H2O(g) What is the limiting reactant when there are .5 moles of O2 and 1.5 moles of NH3 available to react? How much excess is there?
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O2, there is .1 moles of excess NH3.
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If you have an actual yield of 72.3 g of product and the theoreticla yield is 78.7 g, what is your % yield?
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91.8%