SAMPLE PROBLEM 13.8
Determining molar mass from osmotic pressure
SOLUTION:
M =
=
3.61 torr
(0.0821 L . atm/mol . K)(278.15 K)
= 2.08 x 10-4 M
1.50 mL
= 3.12 x 10-7 mol
21.5 mg
= 6.89 x 104 g/mol
x
x
x
x
x
# mol = g/M
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