Stoichiometry I
Chapter 4
University of Arkansas at Little Rock
Dr. Robert Belford




Question 1
The thermal decompostion of potassium chlorate results in the formation of potassium chloride and oxygen. How many grams of potassium chloride are formed when 2.45 g of potassium chlorate completely decomposed?
(A)  0.89g
(B)  2.45g
(C)  1.49g
(D)  0.097g
 
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Question 2
The thermal decompostion of potassium chlorate results in the formation of potassium chloride and oxygen. How many grams of oxygen are formed when 2.45 g of potassium chlorate is completely decomposed?
(A)  0.98g
(B)  2.45g
(C)  0.87g
(D)  0.960g
 
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Question 3
Magnesium hydroxide reacts with phosphoric acid to produce magnesium phosphate and water. What is the maxiumum quantity (in grams) of magnesium phosphate that can be produced if 2.00 g of magnesium hydroxide is added to 2.10g of phosphoric acid?
(A)  2.81g
(B)  3.67g
(C)  2.0g
(D)  2.10g
 
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Question 4
A student performs the reaction in question 3 and gets a yield of 2.67g. What is the percent yield of the students work?
(A)  105%
(B)  100.%
(C)  88.0%
(D)  95.0%
 
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