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Reactions that take place in the real world go until one of the reactants is used up. The reactant that is used up first is called the limiting reactant (LR)because it limits how much product can be made. The reactant that is left over is called the excess reactant (ER). To solve LR/ER problems, use the following guidelines: 1. Write and balance the chemical equation. 2. Find the number of moles available for each reactant. 3. Divide for each reactant: # moles available/# moles required. Remember that the number of moles required comes from the balanced equation. 4. The lowest value is the LR and the highest value is the ER. 5. Then solve the problem. This quiz will cover some basic limiting reactant problems. You will need a periodic table and a calculator. Select the best answer from the provided choices. Good luck!!
6Na + Fe2O3 --> 3Na2O + 2Fe If you are provided 200g of sodium and 250 grams of iron(III) oxide, which substance is the limiting reactant?
Sodium
Iron(III) oxide
Iron
Sodium oxide
6Na + Fe2O3 --> 3Na2O + 2Fe If you are provided 200g of sodium and 250 grams of iron(III) oxide, determine the amount of solid iron produced.
155g
162g
120g
160g
6Na + Fe2O3 --> 3Na2O + 2Fe If you are provided 200g of sodium and 250 grams of iron(III) oxide, determine the amount of sodium oxide produced.
176g
135g
230g
270g
6Na + Fe2O3 --> 3Na2O + 2Fe If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of the iron(III) oxide is used up?
132g
232g
156g
167g
6Na + Fe2O3 --> 3Na2O + 2Fe If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of the iron(III) oxide was left over?
12g
16g
18g
22g
3H2 + N2 --> 2NH3 If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, which element is the excess reactant?
Sodium hydroxide
Hydrogen
Nitrogen
Sodium hydride
What is the measured amount of a product obtained from a chemical reaction?
Actual yield
Theoretical yield
Percentage yield
Mole ratio
True or False?
A chemical reaction stops before the limiting reagent is used up.
True
False
