Download stoichiometry - J. Seguin Science

STOICHIOMETRY
What is stoichiometry?
Stoichiometry
is the
quantitative study of
reactants and products in
a chemical reaction.
Mole Ratios
The proportions of reactants and products (the
recipe) is referred to as the MOLE RATIO.
A mole ratio converts moles of
one compound in a balanced
chemical equation into moles
of another compound.
Example
Reaction between magnesium and
oxygen to form magnesium oxide.
2 Mg(s) + O2(g)
Mole Ratios:
2
:
1
2 MgO(s)
:
2
Practice Problems
N2 + 3 H2
2 NH3
Write the mole ratios for N2 to H2 and NH3 to H2.
Butane (C4H10) is a fuel used in BBQ lighters. Write
out a balance reaction equation for the complete
combustion of butane.
A can of butane lighter fluid contains 1.20 moles of
butane calculate the number of moles of carbon
dioxide given off when this butane is burned.
Mole-Mole Problems
Equation of reaction
2C4H10 + 13O2
8CO2 + 10H2O
Mole ratio
C4H10
CO2
2
:
8
[ from equation]
1.2
:
X
[ problem]
2 : 8 = 1.2 : X
Solving equivalent ratios, MEANS=EXTREMES
X = 4.8 mols of CO2 given off
Homework
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Read section7.1
Bottom half of handout from yesterday
Page 319 #1-3
Questions on pg 320 if more practice needed