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(STOY-KEE-AHM-EH-TREE)

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Stoichiometry is the part of chemistry that studies amounts of reactants and products that are involved in reactions. Chemists use a balanced chemical equation as a basis to calculate how much reactant is used or product that is produced in a reaction. A balanced chemical equation can be interpreted in terms of different quantities, including number of atoms, molecules, or moles.

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In a balanced chemical equation, the coefficient in an equation represents not only numbers of individual molecules but also numbers of moles. The basis for stoichiometry is the law of conservation of mass, which states the mass of the reactants will equal the mass of the products.

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2 Cr+ 1 Mm+ 3 Ch 1 Cr 2 MmCh 3

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Balance the equation. ____N 2 + ____H 2 ____NH 3 This equation can be looked at with ________ molecule of N 2 reacts with __________ molecules of H 2 to produce two ________________ of NH 3. 132 one three molecules

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1 N 2 + 3 H 2 2 NH 3 This equation can be looked at as one mole of N 2 reacts with three ____________ of H 2 to produce _________ moles of NH 3. moles two

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A mole ratio is a _______________ factor derived from the ______________ of a balanced chemical equation interpreted in terms of ______________. conversion coefficients moles Find Given

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Balance the equation and write all six mole ratios. ____Fe + ____O 2 ____Fe 2 O 3 4 32 4 Fe 3 O 2 4 Fe 2 Fe 2 O 3 3 O 2 4 Fe 3 O 2 2 Fe 2 O 3 4 Fe

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1. Balance the equation 2. Identify given and finish line 3. Use mole ratio and/or molar mass to solve 4. Check sig. figs. and round if needed

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C 6 H 12 O 6 +O 2 CO 2 +H 2 O1666 2.00 mol C 6 H 12 O 6 6 mol CO 2 1 mol C 6 H 12 O 6 = 12.0 mol CO 2

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H 2 +N 2 NH 3 8.50 mol H 2 2 mol NH 3 3 mol H 2 = 5.67 mol NH 3 321

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Al + HCl AlCl 3 + H 2 2326 6.000 mol Al 3 mol H 2 2.02 g H 2 2 mol Al 1 mol H 2 = 18.18 g H 2

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Al + HCl AlCl 3 + H 2 2326 4.00 mol HCl2 mol AlCl 3 133.33 g AlCl 3 6 mol HCl1 mol AlCl 3 = 178 g AlCl 3

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C 8 H 18 + O 2 CO 2 + H 2 O2181625 325 g C 8 H 18 1 mol C 8 H 18 18 mol H 2 O 114.26 g C 8 H 18 2 mol C 8 H 18 = 25.6 mol H 2 O

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C 8 H 18 + O 2 CO 2 + H 2 O2181625 145 g O 2 1 mol O 2 16 mol CO 2 32.00 g O 2 25 mol O 2 = 2.90 mol CO 2

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C 5 H 12 +O 2 CO 2 + H 2 O1658 100.0 g C 5 H 12 1 mol C 5 H 12 5 mol CO 2 44.01 g CO 2 72.17 g C 5 H 12 1 mol C 5 H 12 1 mol CO 2 = 304.9 g CO 2

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Zn + HNO 3 Zn(NO 3 ) 2 + N 2 O + 5 H 2 O41410 8.75 g N 2 O 1 mol N 2 O 10 mol HNO 3 63.02 g HNO 3 44.02 g N 2 O 1 mol N 2 O 1 mol HNO 3 = 125 g HNO 3

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N 2 + H 2 NH 3 123 5.40 g H 2 1 mol H 2 2 mol NH 3 17.04 g NH 3 2.02 g H 2 3 mol H 2 1 mol NH 3 = 30.4 g NH 3

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Chemical Calculations Stoichiometry OBJECTIVES: – Calculate stoichiometric quantities from balanced chemical equations using units of moles and mass.

Chemical Calculations Stoichiometry OBJECTIVES: – Calculate stoichiometric quantities from balanced chemical equations using units of moles and mass.

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