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**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?

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

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

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**Mole-Mole Calculations**

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

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**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?

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Stoichiometry of Chemical Equations and Formulas.

Stoichiometry of Chemical Equations and Formulas.

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