Download Moles to Moles Stoichiometry Calculation Notes

Moles to Moles Stoichiometry
Calculation Notes
CP Chemistry
Stoichiometry
 the study of quantitative relationships between
amounts of reactants used and the products
formed in a chemical reaction
 shows the conservation of matter
 mass of products = mass of reactants
 requires balanced equations!!!
Mole Ratios
 ratio of numbers between the numbers of moles
of any two substances in a balanced chemical
equation
 used in stoichiometric calculations
 example: 2 Al + 3 Br2  2 AlBr3
 ratio of Al:Br2 is 2:3
 ratio of Al:AlBr3 is 2:2 (or 1:1)
 ratio of Br2:AlBr3 is 3:2
Mole to Mole Calculations
 problem gives you moles of reactant or product
and asks for moles of another reactant or product
in the chemical equation
Steps to Solving Mole to Mole
Problems
1. Balance chemical equation
2. Place number of moles given above compound
in equation
3. Place an x above the compound for which you
are calculating the number of moles
4. Pull down the ratios from the equation
5. Cross multiply to solve for x
Example 1
How many moles of potassium needs to react with
water to produce 3 moles of H2 gas?
K + H20  KOH + H2
Example 2
How many moles of water can be produced with 6
moles of hydrogen?
H2 + O2  H2O
Example 3
How many moles of oxygen would be required to
fully react with 8 moles of hydrogen?
H2 + O2  H2O
Example 4
How many moles of water can be produced with 4
moles of oxygen?
H2 + O2  H2O
Example 5
How many moles of hydrogen would be required to
produce 10 moles of water?
H2 + O2  H2O
Example 6
How many moles of oxygen would be needed to
produce 20 moles of water?
H2 + O2  H2O