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205stoich - Stoichiometry Glenn V Lo Department of Physical...

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    Stoichiometry Glenn V. Lo Department of Physical Sciences Nicholls State University
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Interpreting Chemical Equations Stoichiometry: study of relationships between amounts of  reactants and products of a reaction. A chemical change is represented by a chemical equation. Example:   Mg(s) + 2 HCl(aq)     H 2 (g) + MgCl 2 (aq) Coefficients are written before the formula of each reactant and  product.  If not written, a coefficient of 1 is implied.  In the example  above, what are the coefficients? Coefficients tell us how the changes in amounts of reactants and  products are related.  In the example above, every time one mole  of Mg is consumed How many moles of HCl are consumed? How many moles of H 2  are produced? How many moles of MgCl 2  are produced?
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Relating Changes in Amounts  of Reactants and Products Consider:   N 2 (g) + 3 H 2 (g)    2NH 3 (g)  How many moles of NH 3  are produced if 3 moles of H 2  are consumed?
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