STEPS
What is the first step you take when doing stoichiometry?
Write the balanced equation.
What do you need to find when you convert moles to moles?
Mole Ratio.
The branch of chemistry that deals with the calculation of the amounts of reactants and products involved in chemical reactions is called:
Stoichiometry
How many moles of Fe2O3 will form from 8.0 moles of Fe?
4Fe + 3O2 → 2Fe2O3
4 moles Fe2O3
What is the second step you take in stoichiometry?
Use the molar mass of your given substance to convert between grams and moles if required.
What do you need to find when you convert between moles and grams?
Molar Mass.
What conversion factor is indicated by coefficients in a balanced equation?
Mole Ratio.
Fe3O4 + 4 CO--->3 Fe + 4 CO2
How many moles of CO are needed to react with 16.5 g of Fe3O4?
0.285 moles CO
What is the third step you take in stoichiometry?
Use the mole ratio from the balanced equation to calculate the moles of your unknown substance.
What is the molar mass of H2O?
18g/mol
Stoichiometry is based around ratios and the law of conservation of:
Mass
What is the last step in stoichiometry?
Convert from moles of your unknown substance to another unit (grams, molecules) if required.
4Fe+3O2--->2Fe2O3
Find the mole ratio of Iron to Oxygen.
4:3
The reactant that is not used up when a reaction is run to completion is called:
Excess Reactant
What is the name of the reactant that you have leftovers of?
Excess reactant
When does a reaction stop?
When you run out of the limiting reactant!