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richiearieona1012
31.12.2019 •
Chemistry
The density of a 20.3 m ch 3oh (methanol) solution is 0.858 g/ml.
what is the molality of this solution? h 2o is the solvent.
a)17.4 m
b)20.8 m
c)23.7 m
d)70.0 m
e)97.6 m
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Ответ:
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
Ответ:
Br
Explanation:
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