Stoichiometry The calculation of quantities using chemical reactions

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Presentation transcript:

Stoichiometry The calculation of quantities using chemical reactions Example: If we want to make 1.5 moles of Fe2O3 using Fe + O2, how much do we need of the reactants to start?

Mole Ratio Conversion factor derived from the coefficients of a balanced equation. It’s the BRIDGE to get across to other elements/compounds

N2 + 3H2  2 NH3 1 mole N2 / 3 mole H2 2 mole NH3 / 1 mole N2

Mole-Mole Calculations Predict products (possible) Balance equation Determine mole ratios Start with what the problem gives you - ALWAYS! Use the correct mole ratio

Magnesium and oxygen react to form ____________. How many moles of the product are produced when 1.2 moles of oxygen react with excess magnesium? How many moles of magnesium reacted in the problem above?