Molarity Calculations
Chapter 4-11
University of Arkansas at Little Rock
Dr. Robert Belford and Casey Hawkins




Question 1
3.0g of a substance is dissolved in water. The volume of this solution is 40.0ml. What is the molarity of the solution? (The molecular weight of the substance is 63.4g/mol.)
(A)  1.2M
(B)  0.0012M
(C)  2.8M
(D)  None of the above
 
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Question 2
A student is performing an experiment with 30.0ml of an unknown solution that has a molarity of 5.0M. How many moles are present in the unknown solution?
(A)  .091mol
(B)  1.5mol
(C)  0.15mol
(D)  None of the above
 
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Question 3
2.5g of a substance is dissolved in water. The molarity of the solution is 3.0M. What is the volume of the solution? (The molecular weight of the substance is 102.4g/mol.)
(A)  73ml
(B)  8.1ml
(C)  81ml
(D)  None of the above
 
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Question 4
An unknown amount of an unknown is dissolved in water. The molarity of the solution is 3.0M. The volume of the solution 50.0ml. What is the mass of the substance? (The molecular weight of the substance is 21.6g/mol.)
(A)  6.9g
(B)  0.0069g
(C)  3.2g
(D)  None of the above
 
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