Section 9.1 Introduction to Stoichiometry

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Presentation transcript:

Section 9.1 Introduction to Stoichiometry 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.

Reaction Stoichiometry Problems Introduction to Stoichiometry Reaction Stoichiometry Problems Problem Type 1: Given and unknown quantities are amounts in moles. Amount of given substance (mol) Problem Type 2: Given is an amount in moles and unknown is a mass Amount of given substance (mol) Amount of unknown substance (mol) Amount of unknown substance (mol) Mass of unknown substance (g)

Problem Type 4: Given is a mass and unknown is a mass. Introduction to Stoichiometry Problem Type 4: Given is a mass and unknown is a mass. Mass of a given substance (g) Problem Type 3: Given is a mass and unknown is an amount in moles. Mass of given substance (g) Amount of given substance (mol) Amount of given substance (mol) Amount of unknown substance (mol) Mass of unknown substance (g) Amount of unknown substance (mol)

Mole Ratio A mole ratio is a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction Example: 2Al2O3(l) → 4Al(s) + 3O2(g) Mole Ratios: 2 mol Al2O3 2 mol Al2O3 4 mol Al 4 mol Al 3 mol O2 3 mol O2

Converting Between Amounts in Moles

Stoichiometry Calculations