STEPS
What is the first step you take when doing stoichiometry?
Write the chemical equation.
Why are you converting to moles as a first step in stoichiometry?
In order to use the Mole Ratio.
What is Stoichiometry?
Mass relationships between substances in a chemical reaction.
Under what conditions does 1 mole of gas occupy 22.4L?
When the gas is at stp.
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 second step you take in stoichiometry?
Balance your chemical equation
When converting grams to moles, what conversion factor do you require?
Molar Mass.
What do we look at to find mole ratios?
The coefficients in a balanced equation.
What is Avogadro's number?
6.022x10^24
How many moles of Fe2O3 will form from 5.0 moles of Fe?
2.5 moles
What is the first step you take in stoichiometry once you have a balanced chemical equation?
Covert to moles, if required
What are you trying to find when you convert moles to liters in solution?
Molarity.
What is Actual Yield?
Actual amount of a product that can be formed with the limiting reactant.
How do we convert moles to grams?
Multiply by molar mass.
How many moles of KClO3 must decompose in order to produce 9 moles of oxygen gas?
6 moles KClO3
What is the second step in stoichiometry?
Use the mole ratio to navigate across a balanced chemical equation, from where you began to where you need to be in order to answer the question.
When converting moles to volume (Liters), what conversion factor do you require?
22.4 moles / Liter
What is a Theoretical Yield?
The maximum amount of a product that can be given off.
What are you calculating for if you divide by 6.022x10^23 then multiply by molar mass?
Converting from particles to grams
How many grams of NaCl will be produced from 1.25 mol of chlorine gas reacting with sodium?
146 g
What is the 3rd step?
Convert from moles to whatever is required to answer the question.
Fe+O2--->Fe2O3
Find the mole ratio of Iron to Oxygen (hint: balance the chemical equation)
4:3
What is Excess Reactant?
Reactant that is not used up when a reaction is run to completion.
What is multiplying molarity by volume then multiplying by 6.022x10^23?
Converting molarity to particles.
Ammonium nitrate decomposes into dinitrogen monoxide gas and water. Determine the amount in grams of water produced if 25.0 g of ammonium nitrate decomposes.
11.3grams H2O