stoichiometry calculations section 12.1 mole to mole calculations
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Stoichiometry Calculations
Section 12.1
Mole to mole calculations
Stoichiometry Calculations
Mole to mole calculationsproblem gives you moles and ask for
moles as an answer
We need 3 moles of H2 gas produced, how many moles of potassium needs to react?
K + H2O KOH + H2
How to solve mole to mole problems
1. Balance equation
2. Place number of moles and x above compound
3. Pull down ratios
4. Cross multiply to solve
Section 12.2Mole to Mole conversions
If the problem gives you moles and ask for moles as an answer you have a mole-mole problem
If you needed 3 moles of H2 gas produced, how many moles of potassium do you need to react?
? Moles 3 moles
2 K + 2 H2O 2 KOH + 1 H2
1x = 2 x 3x = 6 moles
mole
moles
moles
molex
1
3
2
If we place the numbers given in the problem over the balanced equation our ratios are set up for us. Just pull down the numbers to form ratios.
Stoichiometry Practice I2 H2 + O2 2 H2O
How many moles of water can be produced with 6 moles of hydrogen?
6 mol x mol
2 H2 + O2 2 H2O
x = 6 mol
mol
molx
mol
mol
22
6
Stoichiometry Practice I2 H2 + O2 2 H2O
How many moles of oxygen would be required to fully react with 8 moles of hydrogen?
8 mol x mol
2 H2 + O2 2 H2O
2x = 8
x = 4 moles of Oxygen
mol
molx
mol
mol
12
8
Stoichiometry Practice I2 H2 + O2 2 H2O
How many moles of water can be produced with 4 moles of oxygen?
4 mol x mol
2 H2 + O2 2 H2O
x = 4 (2) = 8 mol
mol
molx
mol
mol
21
4
Stoichiometry Practice I2 H2 + O2 2 H2O
How many moles of hydrogen would be required to produce 10 moles of water?
? mol 10 mol
2 H2 + O2 2 H2O
2x = 20
x = 10 moles
mol
mol
mol
molx
2
10
2
Stoichiometry Practice I2 H2 + O2 2 H2O
How many moles of oxygen would be needed to produce 20 moles of water?
? mol 20 mol
2 H2 + O2 2 H2O
2x = 20
x = 10 moles
mol
mol
mol
molx
2
20
1
Be sure to balance the equation first!
Na + Cl2 NaCl
How many moles of sodium would be required to fully react with 10 moles of chlorine?
2Na + Cl2 2NaCl
How many moles of NaCl can be produced with 9 moles of chlorine?
2Na + Cl2 2NaCl
How many moles of Cl2 would be required to produce 18 moles of salt?
2Na + Cl2 2NaCl
How many moles of sodium would be needed to produce 20 moles of salt?
2Na + Cl2 2NaCl