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Percent Yield
Moles to Moles
Grams to Grams
Volume
I really super love stoichiometry!!!!
100
What does the percent yield tell you about the reaction
Efficiency
100
4 FeCr2O7 + 8 K2CO3 + 1 O2 -----> 2 Fe2O3 + 8 K2CrO4 + 8 CO2.............How many moles of FeCr2O7 are required to produce 44 moles of CO2?
22 moles
100
4 FeCr2O7 + 8 K2CO3 + 1 O2 ----> 2 Fe2O3 + 8 K2CrO4 + 8 CO2.................How many grams of FeCr2O7 are required to produce 464 grams of CO2?
1433.34 grams
100
What is used to convert volume to mass?
density
100
Define Stoichiometry
proportional relationship between two or more substances during a chemical reaction
200
How do the values of the theoretical and actual yields generally compare?
theoretical yield is larger than actual yield
200
4 FeCr2O7 + 8 K2CO3 + 1 O2 -----> 2 Fe2O3 + 8 K2CrO4 + 8 CO2............How many moles of O2 are required to produce 107.9 moles of Fe2O3?
53.95 moles
200
4 FeCr2O7 + 8 K2CO3 + 1 O2 -----> 2 Fe2O3 + 8 K2CrO4 + 8 CO2................How many grams of O2 are required to produce 6562 grams of Fe2O3?
657.43 grams
200
When Pentane, C5H12, burns in oxygen, it produces carbon dioxide and water. If 85.5 g of pentane is completely burned, what volume of carbon dioxide is produced? ....................Assume the CO2 cools to room temperature where its density is 1.997g/L. Density of H2O= 1g/mL. Density of pentane=0.63g/mL. Density of O2= 0.0013g/mL
130.056 L
200
Compare the limiting reactant and the excess reactant for a reaction.
limiting reactant is used up before the excess reactant and thus limits a reaction.
300
Give two reasons why a 100% yield is not obtained in actual chemical manufacturing processes.
Reactants do not completely react and reversible reactions can reverse the product back into reactants.
300
6 NaOH + 2 Al ----> 2 Na3AlO3 + 3 H2..................How many moles of aluminum are required to produce 4 moles of hydrogen?
2.67 moles
300
4 FeCr2O7 + 8 K2CO3 + 1 O2 ----> 2 Fe2O3 + 8 K2CrO4 + 8 CO2..............If 112.22 grams of FeCr2O7 react, how many grams of O2 will be consumed?
3.30 grams
300
If 4.34 L of H2O are produced, how many L of pentane are burned? Assume the CO2 cools to room temperature where its density is 1.997g/L. Density of H2O= 1g/mL. Density of pentane=0.63g/mL. Density of O2= 0.0013g/mL. .........................C5H12 + 8O2 -----> 5CO2 + 6H2O
4.592 L
300
Describe the relationship between the limiting reactant and the theoretical yield
The limiting reactant is used to calculate the theoretical yield of a reaction.
400
How do manufactures decide which reactant to use in excess in a chemical reaction?
The least expensive one.
400
6 NaOH + 2 Al ----> 2 Na3AlO3 + 3 H2..............How many moles of Na3AlO3 can be formed from 7.24 moles of NaOH?
2.4133 moles
400
6 NaOH + 2 Al ---> 2 Na3AlO3 + 3 H2................How many grams of aluminum are required to produce 434 grams of hydrogen?
3903.329
400
If 4.4 L of O2 are used, how many L of CO2 are produced? Assume the CO2 cools to room temperature where its density is 1.997g/L. Density of H2O= 1g/mL. Density of pentane=0.63g/mL. Density of O2=0.0013g/mL......................C5H12 + 8O2 -----> 5CO2 + 6H2O
2.46 L
400
What is the key conversion factor needed to solve all stoichiometry problems
mole ratio
500
If 1.85 g Al reacts with an excess of copper (II) sulfate and the percent yield of Cu is 56.6%, what mass of Cu is produced?
3.70 g Cu
500
6 NaOH + 2 Al -----> 2 Na3AlO3 + 3 H2...................How many moles of hydrogen can be prepared from 6.9 moles of aluminum?
10.35 moles
500
6 NaOH + 2 Al ------> 2 Na3AlO3 + 3 H2.................How many grams of Na3AlO3 can be formed from 731 grams of NaOH?
877.121 grams
500
What is the molar volume of any gas at STP
22.41 L/mol
500
Describe a general plan for solving all stoichiometry problems in three steps
1. convert whatever you are given into moles.... 2. multiple by the mole ratio, which gives you moles of the desired substance....... 3. convert the moles into the units that you need for your final answer