Hydrate Nomenclature
Homework Answers
1) Magnesium sulfate monohydrate
10) Mg(NO3)26H2O
2) Manganese (II) nitrate tetrahydrate
11) Cu(NO3)23H2O
3) Calcium chromate dihydrate
12) SnCl22H2O
4) Sodium sulfate decahydrate
5) Tin (IV) chloride pentahydrate
6) Iron (II) heptahydrate
7) Iron (II) phosphate tetrahydrate
8) Barium hydroxide octahydrate
9) Copper (II) sulfate pentahydrate
Rufus Stoichiometry
1) Check for balanced chemical equation and place your game
piece/finger on the number given in the problem.
2) Use Rufus—how many steps/hops do you need to make to get to
the desired unit.
3) Build picket fence—
 # hops = # of vertical lines
4) Number given in the problem along with the unit goes on the top
of the picket fence and drop the unit only down to the next space
(“drop it like it’s hot”)
5) Hops go on top.
Rufus Stoichiometry (cont.)
 Stay on the roads (lines), read sign, and keep going.
 Roads = conversion factors
 Only use the roads to move square to square (“hops”)
 Mole ratio =
 ratio of moles between two chemical compounds
 Used as a bridge to convert from one chemical compound to
another
 Uses coefficients from chemical equation
Example 1:
How many moles of NH3 will be formed from the reaction
of 8.0 moles of H2 with excess N2 ?
N2 + 3H2  2NH3
-(Rufus Method)
Example 2:
How many grams of NH3 will be formed from the
reaction of 26 grams of N2 with excess H2?
N2 + 3H2  2NH3
-(Rufus Method)
Example 3:
How many liters of CO2 are produced when 25.0 grams of
C2H6 combusts?
2C2H6 + 7O2  4CO2 + 6H2O
-(Rufus Method)
Example 4:
How many grams of sodium chloride will be produced
when 7 grams of sodium react with excess chlorine gas?
-(Stoichiometry Beginner Guide Method)
Example 5:
How many grams of aluminum oxide will be produced
when 12 grams of aluminum react with excess oxygen gas?
- (Stoichiometry Beginner Guide Method)
Homework
 Stoichiometry Worksheet