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Mole Ratios
Limiting Reactants
Theoretical Yield
Percent Yield
Steps of Stoichiometry
100
To find the mole ratio you look at this part of a balanced equation.
What are the coefficients?
100
The limiting reactant if 5 mol of H2 and 6 mol of O2 react as 2H2+O2-->2H2O
What is H2?
100
The moles of product made if there are 10 moles of limiting reactant and the mole ratio is 1:1.
What is 10?
100
The yield measured in a lab.
What is actual yield?
100
The first step of any stoichiometry problem.
What is to write the balanced equation?
200
The mole ratio is used to convert between these units.
What are moles?
200
The limiting reactant if 7 mol of H2 and 6 mol of O2 react as 2H2+O2-->2H2O.
What is H2?
200
The theoretical yield is how much of this is made.
What is product?
200
Actual yield is divided by theoretical yield and multiplied by this to find percent yield.
What is 100?
200
For Step 2, I divide grams by this to get moles.
What is the molar mass?
300
The mole ratio for the equation 3Si+2N2-->Si3N4.
What is 3:2:1?
300
If H2 is the limiting reactant in the reaction 2H2+O2-->2H2O, oxygen would be known as this kind of reactant.
What is excess?
300
You cannot directly convert grams of reactant to grams of product, because instead of a gram ratio, you have this.
What is mole ratio?
300
This yield is always more than the actual yield.
What is theoretical yield?
300
The unit to which you must first convert the given substance.
What is moles?
400
The mole ratio for a particular problem should be the coefficient of this to the coefficient of the substance in question.
What is the given substance?
400
DOUBLE JEOPARDY
What is N2H4?
400
The stoichiometric step in which the theoretical yield is found.
What is step 4?
400
The percent yield if the actual yield is 5 and the theoretical yield is 25.
What is 20%?
400
The conversion factor from moles of given to moles of product.
What is the mole ratio?
500
The mole ratio of silicon carbide to carbon monoxide in SiO2+C-->SiC+CO.
What is 1:2?
500
The limiting reactant if 755 g chromium reacts with an excess of phosphoric acid to form chromium phosphate as follows: 2Cr+2H3PO4-->3H2+CrPO4.
What is chromium?
500
The theoretical yield of water if 20 mol H2 and 14 mol O2 react as 2H2+O2-->2H2O.
What is 20 moles?
500
The actual yield if the theoretical yield is 15 grams and the percent yield is 40%.
What is 6?
500
While the last official step is to find moles of product, questions often ask for these units.
What is grams?