michelemosbahiow6yya
09.10.2019 •
Chemistry
Asample of glucose ( c6h12o6 ) of mass 8.44 grams is dissolved in 2.11 kg water. what is the freezing point of this solution? the freezing point depression constant, kf , for water is 1.86 °c/mol. (round your answer to the nearest thousandth)
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Ответ:
- 0.0413°C ≅ - 0.041°C (nearest thousands).
Explanation:
Adding solute to water causes the depression of the freezing point.We have the relation:ΔTf = Kf.m,
Where,
ΔTf is the change in the freezing point.
Kf is the freezing point depression constant (Kf = 1.86 °C/m).
m is the molality of the solution.
Molality is the no. of moles of solute per kg of the solution.
no. of moles of solute (glucose) = mass/molar mass = (8.44 g)/(180.156 g/mol) = 0.04685 mol.∴ molality (m) = no. of moles of solute/kg of solvent = (0.04685 mol)/(2.11 kg) = 0.0222 m.
∴ ΔTf = Kf.m = (1.86 °C/m)(0.0222 m) = 0.0413°C.
∴ The freezing point of the solution = the freezing point of water - ΔTf = 0.0°C - 0.0413°C = - 0.0413°C ≅ - 0.041°C (nearest thousands).
Ответ:
Hi!
Assuming the 9in is the radius, we would multiply it by 2, or add it to itself. We then get 18 in.
Hope this helps!