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# Calculate the freezing and boiling point of a solution CHEM HELP?

Calculate the freezing point and boiling point of a solution containing 12.8 g of naphthalene (C10H8) in 104.0 mL of benzene. Benzene has a density of 0.877 g/cm3

### 2 Answers

- davidLv 74 weeks ago
find the molality of the solution

1 .. find molar mass of C10H8 = ???

2. moles of C10H8 ... 12.8 / molar mass = ???

3. find kilograms of benzene .. 104.0 X 0.877 / 1000 .... use a calculator

4. find molality of the solution .. answer 2 / answer 3

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5. use the formula ,,,

delta T = molal freexing point depression constant X molality (answer from 4)

... 6 ... look up normal freexing point of pure benzene .... then subtract delta T (answer 5)

======= similarly for boiling point elevation

... you have the book with all the constants, I don't. This is how to do it.

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