Stoichiometry Practice Worksheet
Stoichiometry Practice Worksheet
Solve the following stoichiometry grams-grams problems:
1)
2 NaOH + H2SO4 ( 2 H2O + Na2SO4
How many grams of sodium sulfate will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid?
2)
Pb(SO4)2 + 4 LiNO3 ( Pb(NO3)4 + 2 Li2SO4
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) sulfate to do the reaction?
3) Write the balanced equation for the reaction of acetic acid with aluminum hydroxide to form water and aluminum acetate:
4) Using the equation from problem #1, determine the mass of aluminum acetate that can be made if I do this reaction with 125 grams of acetic acid and 275 grams of aluminum hydroxide.
5) What is the limiting reagent in problem #2?
Solutions for the Stoichiometry Practice Worksheet:
For both of the problems on this worksheet, the method for solving them can be found elsewhere in the “Mr. Guch’s Helpdesk” section of my website (). If you’re having problems with stoichiometry problems, I would highly suggest consulting this section of the site before answering these questions.
When doing stoichiometry problems, people are frequently worried by statements such as “if you have an excess of (compound X)”. This statement shouldn’t worry you… what it really means is that this isn’t a limiting reagent problem, so you can totally ignore whatever reagent you have an excess of. Don’t even give it a second thought, because if you do, you’ll run into trouble.
1) 355.3 grams of Na2SO4
2) 313.6 grams of LiNO3
3) Write the balanced equation for the reaction of acetic acid with aluminum hydroxide to form water and aluminum acetate:
3 C2H3O2H + Al(OH)3 ( Al(C2H3O2)3 + 3 H2O
4) Using the equation from problem #1, determine the mass of aluminum acetate that can be made if I do this reaction with 125 grams of acetic acid and 275 grams of aluminum hydroxide.
Two calculations are required. One determines the quantity of aluminum acetate that can be made with 125 grams of acetic acid and the other determines the quantity of aluminum acetate that can be made using 275 grams of aluminum hydroxide. The smaller of these two answers is correct, and the reagent that leads to this answer is the limiting reagent. Both calculations are shown below – the correct answer is circled.
[pic]
5) What is the limiting reagent in problem #2?
Acetic acid.
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