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Veronika [31]
3 years ago
12

Calculate the vapor pressure lowering on an aqueous solution of glycerin that contains 180g of glycerin and 1000g of water at 25

c. The vapor pressure of water at this temperature is 23.8torr.
Chemistry
1 answer:
4vir4ik [10]3 years ago
7 0
The vapor pressure of a solvent is a colligative property. That means that it depends on the number of particles of the solvent in solution and not the nature of the solute dissolved.

You have to use Raoult's law, which states that the vapor pressure of a solution is equal to the vapor pressure of the pure solvent times the molar fraction of the solvent, i.e.:

     P = P°solv * X solv

X solv = number of moles of solvent / number of moles of solution

solvent = water

solute = glycerin

number of moles of water = mass of water / molar mass of water

number of moles of water = 1000 g / 18.02 g/mol = 55.49 mol

number of moles of glycerine = mass of glycerin / molar mass of glycerin

number of moles of glycerin = 180g / 92.09 g/mol = 1.955 mol

X solv = 55.49 mol / (55.49 mol + 1.955 mol) = 0.966

P = 23.8 torr * 0.966 = 22.99 torr = 23.0 torr

=> Vapor pressure lowering = 23.8 torr - 23.0 torr = 0.8 torr

Answer: 0.8 torr.
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2 years ago
What is the concentration in milligrams per milliter of a solution containing 23.5 meq sodium chlorise per milliliter? mw nacl =
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1374.75 is the concentration in milligrams per ml of a solution containing 23.5 meq sodium chloride per milliliter.

Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume.

It is calculated in mg/ml.

The unit of measurement frequently used for electrolytes is the milliequivalent (mEq). This value compares an element's chemical activity, or combining power, to that of 1 mg of hydrogen.

Formula for calculating concentration in mg/ml is

Conc. (mg/ml) = M(eq) /ml ×  Molecular weight / Valency

Given

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Molecular weight pf NaCl = 58.5 g/mol

Valency = 1

Putting the values into the formula

Conc. (mg/ml) = 23.5 ×58.5/1

                       = 1374.75 mg/ml

Hence, 1374.75 is the concentration in milligrams per ml of a solution containing 23.5 meq sodium chloride per milliliter.

Learn more about Concentration here brainly.com/question/14500335

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