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A student has a solution with a mole fraction of 0.20 of chloroform in carbon tetrachloride. What is the molality of chloroform in the solution?

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XCHCl3 = 0.2
XCCl4 = 0.8
grams CCl4 = 0.8 x about 153 = about 123g.
Then m = mols CHCl3/kg CCl4.

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