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3 years ago

The density of a 20.3 M CH 3OH (methanol) solution is 0.858 g/mL.

Chemistry

1 answer:

RUDIKE [14]3 years ago

4 0

Answer:

Molality is 97.6 m (option e)

Explanation:

Density relates mass/volume. It is a data which is involved always to solutions, not solute, neither solvent.

0.858 g/mL = solution mass / 1000mL

0.858 g/mL .1000 mL = 858 grams of solution

Mole of solute = 20.3

Molar weight methanol = 32.04 g/m

Mass of methanol, in solution = molar weight . mol

32.04 g/m . 20.3 = 650.4 g

Mass of solution = Mass of solvent + Mass of solute

858 g = Mass of solvent + 650.4g

Mass of solvent = 858 g - 650.4 g → 207.6 g

So 20.3 moles of solute are contained in 207.6 g of solvent.

Molality is moles of solute/kg of solvent

20.3 m / 0.2076 kg = 97.6 m

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