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April 18, 2014

Homework Help: chemistry

Posted by liz on Tuesday, May 22, 2012 at 8:50pm.

a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture, the temperature, after thorough stirring, fell to -5.4 degrees Celsius. she poured off the solution through a screen into a beaker. the mass of the solution was 101.8 g.

what was the freezing point depression?

what was the molality of the methanol?

how much methanol was in the decanted solution?

how much water was in the decanted solution?

how much methanol would there be in the solution with 1 kg of water, with methanol at the same concentration as she had in her experiment?

what did she find to be molar mass of methanol, assuming she made the calculation properly?

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