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Stoichiometry
Using the above picture, how many Meals can be made with the following?
38 Nuggets
132 French Fries
If we had infinite Drinks, how many Nuggets would
we need (to make the max amount of Meals) with
271 French Fries?
13 Bottled Drinks
Mark which of the 3
would decide how many
meals could be made.
If we had infinite French Fries, how many Drinks
would we need (to make the max amount of Meals)
with 581 Nuggets?
o We can use the measure of one substance to find a measure of another substance.
o To do this, we use a ratio of moles based on the coefficients of the balanced reaction.
o We can accurately determine the reactants or products of a chemical reaction.
? mole of 1 substance = ? mole of another substance.
(Using coefficients of a balanced equation)
Using the following equation, answer the following four questions:
2 Cu2O(s)  4 Cu(s) + O2(g)
1. How many moles of Copper (I) Oxide were used
to produce 3.15 moles of Oxygen gas?
2. How many moles of Oxygen gas were produced
along with 19.4 grams of Copper?
3. How many grams of Copper were produced
from 4.40 moles of Copper (I) Oxide?
4. How many molecules of Oxygen Gas were
produced from 37.8 grams of Copper (I) Oxide?
Stoichiometry Practice #1
Balance the Following Equation and Answer ALL the Questions that follow:
_____ K + _____ Ca3(PO4)2  _____ Ca + _____ K3PO4
1. What do the coefficients of balanced
equations show about the moles,
molecules, etc. of that reaction?
2. Name the compounds from above:
____________________________ Ca3(PO4)2
____________________________ K3PO4
3. How many moles of K would be needed
to produce 3.2 moles of Ca?
4. How many moles of Ca3(PO4)2 is needed to
produce 0.8 moles of K3PO4?
5. How many moles of K3PO4 are produced
with 8.4 moles of Ca?
6. How many moles of K are needed to react
with 4.5 moles of Ca3(PO4)2?
7. How many moles of Ca3(PO4)2 are needed
to produce 13.1 moles of Ca?
8. How many moles of Ca are produced from
0.25 moles of K?
9. How many moles of K3PO4 are produced
from 52.3 grams of K?
10. How many grams of Ca3(PO4)2 are needed
to react with 2.2 moles of K?
Stoichiometry Practice #2
_____ NH3  _____ N2 + _____ H2
1. How many moles of NH3 is needed to
produce 8.1 moles of H2 using this rxn?
2. How many moles of NH3 is needed to
produce 0.3 moles of N2 using this rxn?
3. How many moles of N2 are produced
along with 1.5 moles of H2 using this rxn?
4. How many moles of H2 are produced from
4.3 moles of NH3 using this rxn?
5. How many grams of H2 are produced
along with 1.6 moles of N2 using this rxn?
6. How many moles of N2 are produced from
80.5 grams of NH3 using this rxn?
_____ C3H8 + _____ O2  _____ CO2 + _____ H2O
1. How many moles of C3H8 is needed to
produce 4.5 moles of H2O using this rxn?
2. How many moles of O2 is needed to
produce 1.3 moles of CO2 using this rxn?
3. How many moles of H2O are produced
from 7.7 moles of O2 using this rxn?
4. How many moles of CO2 are produced
from 3.45 x 1024 molecules of O2 using this
reaction?
5. How many molecules of H2O are
produced along with 2.6 moles of C3H8
using this reaction?
6. How many grams of CO2 are produced
from 14.3 moles of O2 using this rxn?