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KiRa [710]
3 years ago
9

A

Chemistry
1 answer:
deff fn [24]3 years ago
4 0

Answer:

The concentration given here is in terms of molality which is moles of solute per kg of solution.  Therefore, we multiply the concentration by the total mass of the solution and obtain the moles of solute. We can convert this into grams and calculate for the solvent.

0.630 mol KBr / kg solution ( .086 kg solution ) = 0.0542 mol KBr

0.0542 mol Kbr ( 119.002 g / 1 mol ) = 6.4475 g KBr

Mass of solvent = 86 - 6.4475 = 79.55 g water

Explanation:

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To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.

<h3>What is the purpose of the sodium sulfate?</h3>
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