Chem 102 - General Chemistry » Winter 2022 » Quiz 1
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Question #1
A solution is made by mixing acetone, (CH3)2CO (Molar Mass =58.08 g/mole), and ethanol, CH3CH2OH (Molar Mass =46.07 g/mole) that contains 0.207 mol fraction of acetone. Determine the concentration of acetone in terms of mass percent. Mass percent = ____ %
A.
23.9
B.
24.8
C.
23.1
D.
25.7.
Question #2
What is the mole fraction of a 3.207 M aqueous solution of lead(II)nitrate (Molar Mass=331.22g/mole)? The density of the solution is 1.387 g/mL. (For water use 18.02 g/mole for Molar Mass). mole fraction =
A.
0.139
B.
0.141
C.
0.163
D.
0.151
Question #3
Calculate the change in the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (Mm = 86.18 g/mol) at 49.6°C. [P°hexane = 400.0 torr at 49.6°C.]
A.
346 torr
B.
246 torr
C.
400. torr
D.
54 torr
E.
154 torr
Question #4
What are the major solute-solvent interactions created when Na+ ions dissolves in CH3CH2CH2CH2OH?,,,,
A.
dipole induced dipole
B.
ion-dipole
C.
ion-induced dipole
D.
London or dispersion
E.
dipole-dipole
F.
hydrogen bonding
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