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vodka [1.7K]
2 years ago
7

A (non-aqueous ) solution is found to have a molarity of 2.50 molal and experiences a freezing point depression of 5.20 degree C

. What is kf of the solvent (in degrees c/m) ?
Chemistry
1 answer:
Crazy boy [7]2 years ago
6 0

Answer:

Kf for the solvent is 2.08°C / m

Explanation:

Formula for lowing point depression is:

ΔT = Kf . m

Then, the ΔT is 5.20°C and the molality is found to be, 2.50 m

5.20°C = Kf . 2.50 m

5.20°C /2.50 m = Kf  →  2.08°C / m

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Read 2 more answers
1 mol super cooled liquid water transformed to solid ice at -10 oC under 1 atm pressure.
Arada [10]

Answer:

Explanation:

Given that:

number of moles of super cooled liquid water = 1

Melting enthalpy of ice = 6020 J/mol

Freezing point =0 °C = (0 + 273 K)= 273 K

The decrease in entropy of the system during freezing for 1 mol (i.e during transformation from liquid water to solid ice )  = - 6020 J/mol × 1 mol /273 K = -22.051 J/K

Entropy change during further cooling from 0 °C (273 K) to -10 °C (263 K)

\Delta \ S = \int\limits^{T_2}_{T_1}\dfrac{nC_p(s)dT}{T}

\Delta \ S = {nC_p(s)In \dfrac{T_2}{T_1}

\Delta \ S = {(1*37.7)In \dfrac{263}{273}

Δ S = -1.4 J/K

Total entropy change of the system = - 22.05 J/K - 1.4 J/K = - 23.45 J/K

Entropy change of universe = entropy change of the system+ entropy change of the surrounding

According to the second law of thermodynamics

Entropy change of universe  >0

SO,

Entropy change of the system + entropy change in the surrounding > 0

Entropy change in the surrounding > - entropy change of the system

Entropy change in the surrounding > - (- 23.53 J/K)

Entropy change in the surrounding > 23.53 J/K

b) Make some comments on entropy changes from the obtained data.

From the data obtained; we will realize that the entropy of the system decreases as cooling takes place when water is be convert to ice , randomness of these molecules reduces and as cooling proceeds , hence, entropy reduces more as well and the liberated heat will go into the surrounding due to this entropy of the surrounding increasing.

4 0
2 years ago
Kesha is in charge of dying boiled eggs with her cousins, C.J and Carvin. She read on the directions that you add 2 tablespoons
marin [14]

Answer:

Independent: The amount of vinegar

Dependent: The dye result on the egg

Controlled: The type of eggs, the size of jars, the dye tablet, how much she stirs, etc.

Explanation:

The independent variable is what is being changed, which in this case, is the amount of vinegar being added to each jar. The dependent variable is what is being measured or observed. Kesha is looking for what happens to the egg when she adds more vinegar with the dye. Lastly, there could be a couple of controlled variables. Like, the dye tablet, the size and brand of the eggs, the types of jars, how long she stirs each egg, and so on. The controlled are just variables kept constant so that any result observed is because of one singular change, the independent variable.

4 0
2 years ago
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