Steps of Stoichiometry
What is the first step you take when doing stoichiometry?
Write the balanced equation.
What is the molar mass of Sb?
121.76 g/mol Sb
Balance the following equation
Na + O2. --> Na2O
4Na + O2 --> 2Na2O
What is the definition of a limiting reactant?
A reactant that is used up first in a chemical reaction.
If my actual yield for a reaction was 8 grams, and my theoretical yield was 10 grams, what is my percent yield?
80%
What is step #2 to solving stoichiometry problems?
Convert grams, or number of representative particles of the substance given in the problem to moles.
What is the molar mass of Na3PO4?
163.84 g/mol. Na3PO4
Balance the following equation
N2 + F2 --> NF3
N2 + 3F2 --> 2NF3
What is Actual Yield?
Actual amount of a product that can be formed with the limiting reactant, determined experimentally
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 3rd step to solving stoichiometry problems?
Mole to mole ratio
What is the molar mass of hydrogen peroxide?
34.02 g/mol H2O2
Balance the following equation.
P + O2 --> P2O5
4P + 5O2 --> 2P2O5
What is a reactant?
An element or product that react together to form a product.
How many grams of lithium Nitrate will be needed to make 250 grams of lithium sulfate assuming that you have an adequate amount of lead (IV)
Pb(SO4)2 + 4 LiNO3 --> Pb(NO3)4 + Li2SO4
313.48g of LiNO3
What is the 4th and last step to solving stoichiometry problems?
Convert moles of the substance just solved for into grams
What is the molar mass of (NH4)2S?
68.13 g/mol of (NH4)2S
Balance the following equation
C6H10 + O2 --> CO2 + H2O
2C6H10 + 17O2 --> 12CO2 + 10 H2O
What is a product?
The result reactants reacting together or reactants breaking down.
How many grams of NaCl will be produced from 88.6 grams of chlorine gas reacting with 46 grams of sodium?
146 g
If you were converting from grams of one reactant to particles of a product, which ratio would you need to modify in the regular 3 ratio stoichiometry set-up
the last ratio, going out to particles instead of grams
What is the molar mass of Zn(C2H3O2)2
183.4 g/mol Zn(C2H3O2)2
Balance the following equation
CO2 + H2O --> C6H12O6 + O2
6 CO2 + 6 H2O --> C6H12O6 + 6 O2
What is the definition of molar mass?
Everyone should get this right... (xg/mol.)
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.
11.3 grams H2O