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Composition Stoichiometry deals with the mass relationships of elements in compounds. Reaction Stoichiometry involves the mass relationships between reactants.

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Presentation on theme: "Composition Stoichiometry deals with the mass relationships of elements in compounds. Reaction Stoichiometry involves the mass relationships between reactants."— Presentation transcript:

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2 Composition Stoichiometry deals with the mass relationships of elements in compounds. Reaction Stoichiometry involves the mass relationships between reactants and products in a chemical reaction. All reaction Stoichiometry calculations start with a balanced chemical equation. This equation gives the relative numbers of moles of reactants and products.

3  Reaction-Stoichiometry problems can be classified according to the information given in the problem and the information you are expected to find, the unknown.  The given and the unknown may both be reactants, they may both be products, or one may be a reactant and the other a product!  The masses are generally expressed in grams.  Stoichiometric problems are solved by using ratios from the balanced equation to convert the given quantity.

4 Given and unknown quantities are amounts in moles.  Road Map…

5 Given is an amount in moles and the unknown is a mass that is often expressed in grams.  Road Map…

6 Given is a mass in grams and the unknown is an amount in moles.  Road Map…

7 Given is a mass in grams and the unknown is a mass in moles.  Road Map…

8  Solving any reaction-stoichiometry problem requires the use of a mole ratio to convert from moles or grams of one substance in a reaction to moles or grams of another substance.  A mole ratio is a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction.  This information is obtained directly from the balanced chemical equation.

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10 Mole ratios are exact, so they do not limit the number of significant figures in a calculation. The number of significant figures in the answer is therefore determined only by the number of significant figures of any measured quantities in a particular problem.

11  Recall that the molar mass is the mass, in grams, of one mole a substance.  You will need to determine molar masses using the periodic table.  For Example:

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14  2HgO(s)→2Hg(l)+O ₂(g)  4NH ₃(g)+6NO(g) →5N ₂(g)+6H₂O(l)

15  You will produce a multi-media file using SmartBoard software and your choice of technology to create a presentation of the 4 types of reaction-stoichiometry problems.  You are allowed to choose four of the problems from the sample problem sheet to use in your project.  You must include video and voice while describing how to problem solve each of the four types of problems.  Eye candy is important and you may work in pairs of two.  Finished projects must be uploaded to the SchoolWeb site by the end of class and be titled by students first names.


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