1. A solute is a strong electrolyte that ionizes into 4 ions. What is the molar

Question

1. A solute is a strong electrolyte that ionizes into 4 ions. What is the molar mass of this solute if 21.27 grams added to exactly 1 kg of solvent change the boiling point by 0.654. (The Kb value for this solute is 1.324 °C/m). Record your answer as a whole number.

2.Ethanol has a Kb of 1.22 °C/m and usually boils at 78.4 °C. How many mol of an nonionizing solute would need to be added to 43.69 g ethanol in order to raise the boiling point to 83.

3.

Select the conditions where solid solutes have the highest solubility in water. Select those that USUALLY apply.

Structural effects: The molecule should be Select an answer highly polar slightly polar nonpolar .

Temperature: The temperature should be Select an answer high low .

Agitation: Agitating the solution Select an answer increases decreases has no affect on the solubility.

Pressure: Solubility is highest when pressure is Select an answer high low pressure does not affect the solubility .

4.

Select the conditions where gas solutes have the highest solubility in water. Select those that USUALLY apply.

Temperature: The temperature should be Select an answer high low .

Agitation: Agitating the solution Select an answer increases decreases has no affect on the solubility.

Pressure: Solubility is highest when pressure is Select an answer high low pressure does not affect the solubility .

5.

Select the conditions where liquid solutes have the highest solubility in water. Select those that USUALLY apply.

Structural effects: The molecule should be Select an answer highly polar slightly polar nonpolar .

Agitation: Agitating the solution Select an answer increases decreases has no affect on the solubility.

Pressure: Solubility is highest when pressure is Select an answer high low pressure does not affect the solubility .

Explanation / Answer

Ans 1 :

The boiling point elevation = i x kb x m

where i is vant hoff's factor = 4

Kb = boiling point constant =  1.324 °C/m

m is molality

putting all the values :

0.654 = 4 x 1.324 x m

m = 0.1235 m

Molality = number of moles / mass of solvent in kg

0.1235 = n / 1

n = 0.1235 mol

Molar mass = given mass / number of mol

= 21.27 / 0.1235

= 172 g/mol

So the mass of solute will be 172 g/mol.

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