Boiling Point Elevation
Chapter

Dr. Robert Belford & Xiaomin Tu



Question 1
Ethylene glycol is a common component of anti-freeze. A solution of ethylene glycol and water has a boiling point of 101.00C. What is the molality of the solution? Kbp of water is 0.51210C/m
(A)  1.75m
(B)  1.95m
(C)  2.00m
(D)  2.25m
 
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Question 2
How many grams of ethylene glycol (MW=62.068g/mol) is added to 250g of water to increase the boiling point by 1.00C? Kbp of water is 0.51210C/m
(A)  29.3g
(B)  29.7g
(C)  30.3g
(D)  31.3g
 
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Question 3
Determine the boiling point of a 0.80m solution of CaF2.
(A)  99.59
(B)  101.23
(C)  101.41
(D)  101.59
 
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Question 4
Methyl Salicylate is used in food flavoring and pharmaceuticals. Adding 1.25g of methyl salicylate (MW=152.14g/mol) to 100g of benzene will raise the boiling point to what temperature? Kbp of benzene is 2.530C/m, and the boiling point for pure benzene is 80.100C.
(A)  79.69
(B)  80.31
(C)  80.69
(D)  81.31
 
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Question 5
Adding 36.0g of glucose (MW= 180g/mol) to 500.0 g of ethyl alcohol will raise the boiling point to 79.30C. Pure ethanol has a boiling point of 78.50C. What is the value for Kb?
(A)  1.7
(B)  1.8
(C)  1.9
(D)  2.0
 
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