Stoichiometry
Chemistry Essentials - 028
bozemanscience.com
Stoichiometry
Chemistry Essentials - 028
bozemanscience.com
Stoichiometry
Chemistry Essentials - 028
bozemanscience.com
Stoichiometry
Balanced
Chemical Equation
Coefficients
Mole proportions
Expected
product
Limiting
reactant
Percent
yield
Molar mass
of gases
Titrations
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Expected Product
24.6 g
CH4 + O2
CO2 +
H2O
???
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Expected Product
24.6 g CH4
1 mole CH4 2 mole H2O 18.02 g H2O
1
16.05 g CH4 1 mole CH4 1 mole H2O
Grams X
24.6 g
CH4 + 2O2
Moles
X
Moles
X
CO2 + 2 H2O
Grams
???
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Expected Product
24.6 g CH4
1
24.6 g
X
1 mole CH4 2 mole H2O 18.02 g H2O
Moles
X
Moles
X
Grams
16.05 g CH4 1 mole CH4 1 mole H2O
CH4 + 2O2
CO2 + 2 H2O
???
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Expected Product
24.6 g CH4
1
24.6 g
X
1 mole CH4 2 mole H2O 18.02 g H2O
X
Moles
X
Grams
16.05 g CH4 1 mole CH4 1 mole H2O
CH4 + 2O2
CO2 + 2 H2O
???
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Expected Product
24.6 g CH4
1
24.6 g
X
1 mole CH4 2 mole H2O 18.02 g H2O
X
X
Grams
16.05 g CH4 1 mole CH4 1 mole H2O
CH4 + 2O2
CO2 + 2 H2O
???
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Expected Product
24.6 g CH4
1
24.6 g
X
1 mole CH4 2 mole H2O 18.02 g H2O
X
X
16.05 g CH4 1 mole CH4 1 mole H2O
CH4 + 2O2
CO2 + 2 H2O
???
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Expected Product
24.6 g CH4
1
24.6 g
X
1 mole CH4 2 mole H2O 18.02 g H2O
X
X
16.05 g CH4 1 mole CH4 1 mole H2O
CH4 + 2O2
55.2 g H2O
CO2 + 2 H2O
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Limiting Reactant
Before
After
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Limiting Reactant
Before
CH4 + 2O2
After
CO2 + 2 H2O
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Limiting Reactant
10.0 g
10.0 g
CH4 + 2O2
CO2 + 2 H2O
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Limiting Reactant
10.0 g CH4
1
Grams
10.0 g O2
1
X
X
1 mole CH4 1 mole CO2 44.01 g CO2
X
X
X
X
16.05
g CH4 1 mole
CH4 1 mole
CO2
Moles
Moles
Grams
1 mole O2 1 mole CO2 44.01 g CO2
32.00 g O2
CH4 + 2O2
2 mole O2
1 mole CO2
CO2 + 2 H2O
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Limiting Reactant
10.0 g CH4
1
10.0 g O2
1
X
X
1 mole CH4 1 mole CO2 44.01 g CO2
X
X
16.05 g CH4 1 mole CH4 1 mole CO2
1 mole O2
32.00 g O2
CH4 + 2O2
X
1 mole CO2 44.01 g CO2
2 mole O2
X
1 mole CO2
CO2 + 2 H2O
27.4 g CO2
6.88 g CO2
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Percent Yield
(
)
Actual Yield
(
)
Actual Yield
Predicted Yield
6.19 g CO2
6.88 g CO2
X 100
X 100
90.0 Percent Yield
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Molar Mass of Gases
Grams X
Moles
X
Moles
X
Grams
STP
20.0 L
CH4 + 2O2
How many liters of H2O?
CO2 + 2 H2O
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Molar Mass of Gases
20.0 L CH4
1
20.0 L
X
1 mole CH4 2 mole H2O 22.4 L H2O
22.4 L CH4
STP
CH4 + 2O2
X
X
1 mole CH4 1 mole H2O
40.0 L H2O
CO2 + 2 H2O
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2NaOH + H2C2O4
Na2C2O4 + 2 H2O
1.00 Molar NaOH
Phenolphthalein
0
1
2
3
4
5
6
7
8
9
10
11
12
13
pH
14
equivalence
point
H 2C 2 O 4
Unknown ???
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2NaOH + H2C2O4
30.0ml soln
1
X
X
1 Liter soln
1000 mL soln
90.0 g H2C2O4
1 mol H2C2O4
=
X
1 mol NaOH
1 Liter soln
Na2C2O4 + 2 H2O
X
1 mol H2C2O4
2 mol NaOH
1.35 g H2C2O4
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Did you learn?
To use stoichiometric calculations
to predict the results of a reaction.
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Did you learn?
To relate quantities to stoichiometric
relationships (including limiting
reactants and completion)
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Acknowledgements
Amit6. English: Unicode U+2441 ⑁ Ocr Chair, September 24, 2011. Own work. http://commons.wikimedia.org/wiki/File:OCR_chair.svg.
File:Balanced Scales.svg, n.d. http://commons.wikimedia.org/wiki/File:Balanced_scales.svg.
File:Bunsen Burner.jpg, n.d. http://commons.wikimedia.org/wiki/File:Bunsen_burner.jpg.
“File:Carbon Dioxide 3D Spacefill.png,” August 22, 2013. http://en.wikipedia.org/wiki/File:Carbon_dioxide_3D_spacefill.png.
File:Flametest--.swn.jpg, n.d. http://commons.wikimedia.org/wiki/File:Flametest--.swn.jpg.
“File:Methane-3D-Space-Filling.svg,” August 22, 2013. http://en.wikipedia.org/wiki/File:Methane-3D-space-filling.svg.
“File:Water Molecule 3D.svg,” August 22, 2013. http://en.wikipedia.org/wiki/File:Water_molecule_3D.svg.
Michou311. Français : Stickman, February 18, 2012. Own work. http://commons.wikimedia.org/wiki/File:Stickman.gif.
Ulflund. English: Space-Filling Model of the Oxygen Molecule (O2) Created with Jmol (http://chemapps.stolaf.edu/jmol/jmol.php?model=O2)., July 18, 2012. Own work. http://commons.wikimedia.org/wiki/File:Oxygen_molecule.png.
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