Transcript Chapter 12 Stoichiometry - Conejo Valley Unified School

(STOY-KEE-AHM-EH-TREE)
• Stoichiometry is the part of chemistry that studies
amounts of reactants and products that are
involved in reactions.
• Chemists use a balanced chemical equation as a
basis to calculate how much reactant is used or
product that is produced in a reaction.
• A balanced chemical equation can be interpreted
in terms of different quantities, including number
of atoms, molecules, or moles.
• In a balanced chemical equation, the coefficient
in an equation represents not only numbers of
individual molecules but also numbers of moles.
• The basis for stoichiometry is the law of
conservation of mass, which states the mass of
the reactants will equal the mass of the products.
2 Cr
+
1 Mm +
3 Ch

1 Cr2MmCh3
Balance the equation.
1
3
2
____N
+
____H

____NH
2
2
3
This equation can be looked at with
________
molecule of N2 reacts with
one
three molecules of H2 to produce
__________
molecules
two ________________
of NH3.
1 N2
+
3 H2  2 NH3
This equation can be looked at as one
mole of N2 reacts with three
moles
____________
of H2 to produce
two moles of NH3.
_________
conversion
A mole ratio is a _______________
factor
coefficients of a
derived from the ______________
balanced chemical equation interpreted in
moles
terms of ______________.
Balance the equation and write all six mole
ratios.
3
2
4
____Fe
+
____O
____Fe
2 
2O3
*
Remember, stoichiometry is based on the
law of conservation of mass.
Mass of reactants = Mass of products
Balance the equation
1 3H8 + ____O
5
3
4
____C
2  ____CO2 + ____H2O
*
C6H12O6 +
O2
CO2 +
H2O
H2 +
N2
NH3
Al(s) +
O2(g)
Al2O3(s)