Molality
Chapter 14-2
Dr. Robert Belford & Rebekah Reinhart
Question 1
Calculate the molality of a solution containing 112g CH
3
OH in 134mL of water. The density of water is 1.0g/mL and the molecular weight of CH
3
OH is 32.0g/mol
(A)
46.9m
(B)
38.3m
(C)
26.1m
(D)
None of the above
Hint
Your response
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Question 2
Calculate the molality of all the ions by adding 1.4g NaCl to 75mL of water.
(A)
0.64m
(B)
0.16m
(C)
0.32m
(D)
None of the above
Hint
Your response
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Question 3
Calculate the molality of the Br
-
ion by adding 2.2g MgBr
2
to 100mL of water. The molecular weight of MgBr
2
is 184.1g/mol,
(A)
0.36m
(B)
0.12m
(C)
0.24m
(D)
None of the above
Hint
Your response
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Question 4
What volume of water would be required to prepare a 32.6m solution from 78g of CaCl
2
?
(A)
21mL
(B)
64mL
(C)
44mL
(D)
None of the above
Hint
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Question 5
What mass of KBr should be added to 120mL of water to create a 1.8m solution? The molecular weight of KBr is 119g/mol.
(A)
7.93g
(B)
34.5g
(C)
25.7g
(D)
None of the above
Hint
Your response
Not answered yet