1. (STOY-KEE-AHM-EH-TREE)
Stoichiometry
(STOY-KEE-AHM-EH-TREE)
Studies the amounts of reactants and products involved in reactions
Based on the law of conservation of mass (balanced chemical equation)

3. “to produce” or “yield”
Chemical Equations
2 H2 (g) + O2 (g) H2O (l)
coefficient
Product(s)
Reactants
“Reactants with”
“to produce” or “yield”
State of matter

4. Chemical Equation Interpretation+ O2 →
2 H2O
Two molecules
One molecule
2 moles
1 mole
2(2.02 g)
32.00 g
2 (18.02 g)
36.04 g reactants
36.04 g product
Interpretation

5. Mole Ratio
Conversion factor derived from the coefficients of a balanced chemical equation
Example: Synthesis of iron(III) oxide from its constituent elements. ____Fe + ____O2  ____Fe2O3
Fill in the mole ratios by hand

6. Stoichiometry Roadmap
Reaction: A  B
Given
Find

7. Example 1
How many grams of water can be produced by burning 325 g of octane (C8H18)?

8. Example 2
What mass of carbon dioxide is produced by the complete combustion of g of pentane (C5H12)?

9. Example 3
How many grams of HNO3 are required to produce 8.75 g of nitrogen dioxide according to the following equation?
Zn + HNO Zn(NO3)2 + NO2 + H2O