Just plug into the equation.
delta T = Kf*m
delta T = 0.930
Kf = 1.86, a constant for water.
m is molality. That's the only unknown. Solve for that.
The freezing-point depression is -0.930 Celsius degree. Determine the molality of the solution of an unknown nonelectrolyte in water.
Please help!! I do not understand this problem!
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