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Stoichiometry. Mole Map. Mass Mountain. Mole Island. Particle Peninsula. Using the Mole Map with Chemical Equations. We can convert between Moles, Particles and Grams, but… This only gives us information about one substance! - PowerPoint PPT Presentation
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Stoichiometry
Mole Map
Mole Island
Particle Peninsula
Mass Mountain
Using the Mole Map with Chemical Equations
• We can convert between Moles, Particles and Grams, but…
• This only gives us information about one substance!
• How do we determine how much reactants to use in a chemical reaction? Or how much product we will create?
STOICHIOMETRY
Proportional Relationships
I have 5 eggs. How many cookies can I make?
3/4 c. brown sugar1 tsp vanilla extract2 eggs2 c. chocolate chipsMakes 5 dozen cookies.
2 1/4 c. flour1 tsp. baking soda1 tsp. salt1 c. butter3/4 c. sugar
5 eggs 5 doz.
2 eggs= 12.5 dozen cookies
Ratio of eggs to cookies
Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
150 cookies
Mole Ratio
• A conversion factor that converts moles of one compound in a balanced chemical equation into moles of another compound.
2 H2 + O2 2 H2O
• Coefficients tell how many particles (or MOLES of particles) of each chemical is needed in the reaction.
Mole Ratios
How many moles of water will be formed if I react 14.0 moles of oxygen with excess H2?
2 H2 + O2 2 H2O
14.0 moles O2 x 2 moles H2O = 28.0 moles H2O 1 mole O2
MOLE RATIOFrom the balanced equation.
Coefficients tell moles of each substance.
Mole Island
Stoichiometry Sea Known UnknownSubstance A Substance B
Mass Mountain
Particle Peninsula
Mole Island
Mass Mountain
Particle Peninsula
Mole RatioRaft
1 mole = 6.022 x 10 23 particles
(atoms or molecules)
Mass
Particles
Mole Mole
Mass
Particles
Known
Substance A1 mole = molar mass (g)
Use coefficientsfrom balanced
chemical equation
1 mole =
6.022 x
1023 partic
les
(atoms o
r molecu
les)
1 mole =
molar m
ass (g
)
Unknown
Substance B
Stoichiometry Steps1. Write a balanced equation.2. Identify known & unknown.3. Line up conversion factors.
– Mole ratio - moles moles– Molar mass - moles grams
Core step in all stoichiometry problems!!
– Mole ratio - moles moles
4. Check answer.
Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
How many moles of KClO3 must decompose in order to produce 9 moles of oxygen gas?
2KClO3 2KCl + 3O2 ? mol 9 mol
Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
O2 KClO3
x mol KClO3 = 9 mol O2 = 6 mol KClO3
2 mol KClO3
3 mol O26 mol
Stoichiometry
2 TiO2 + 4 Cl2 + 3 C CO2 + 2 CO + 2 TiCl4
4.55 molx mol
C Cl2
x mol Cl2 = 4.55 mol C3 mol C
= 6.07 mol Cl24 mol Cl2
C TiO2
x molecules TiCl4 = 115 g TiO2 80 g TiO2
= 8.66x1023 molecules TiCl4
1 mol TiO2 2 mol TiCl42 mol TiO2
6.02x1023 molecules TiCl41 mol TiCl4
x g TiO2 = 4.55 mol C3 mol C
= 243 g TiO2
2 mol TiO2 80 g TiO2
1 mol TiO2
How many moles of chlorine will react with 4.55 moles of carbon?
How many grams of titanium (IV) oxide will react with 4.55 moles of carbon?
x g
How many molecules of TiCl4 will react with 115 g TiO2?
TiO2 TiCl4
x molecules115 g