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AP Chemistry
Name __________________________________
Period ___ Date ___/___/___
3  Stoichiometry
I can:
Limiting Reactant Problems
Calculate the molar mass of a substance.
Show the units of molar mass as grams/mol or
State and explain Avagadro’s number.
Convert between moles, particles (atoms,
molecules, etc.), mass, and volume (at STP).
Percent Composition
 Calculate the percent composition for various
Balance equations by adding coefficients.
Recognize when an equation is balanced.
State that combustion is another name for
Write an equation for a combustion reaction
given only the fuel that is burned.
Use the stoichiometric factor ( of the
problem) to convert from moles of one
substance to moles of a different substance.
(i.e. In the equation: N2 + 3H2  2NH3,
3 mol H2  2 mol NH3)
Solve problems involving Limiting Reactants
Calculate how much excess chemical is left
over after a reaction.
Calculate the mass of each element in a given
compound given data such as the masses of
CO2 and H2O formed in a combustion
Use mass, mole, stoichiometry, and/or
combustion information to calculate the
empirical formula and molecular formula of
an unknown substance.
Percent Yield Problems
Correctly label substances in an equation as
solid (s) , gas (g), liquid (l), or aqueous (aq)
Stoichiometry Problems
State that the formulas of reactants and
products should not be changed in order to
balance equations.
Determine the limiting reactant and excess
reactant in a problem.
Chemical Analysis Problems
Balancing Equations
Recognize that a problem with two “given
values” is a limiting reactant problem.
Use stoichiometry to calculate the theoretical
yield (mass of a product) in a problem.
State that actual yields are usually given in a
Use the theoretical yield and actual yield to
calculate the percent yield.
Continuous Variation Data
Use “continuous variation” laboratory data to
determine the correct mole ratio of an
equation. (Micro Mole Rockets Lab)