Use the Ref to access im The biling point of diethyl ether, cH3cHOCH CH, is 34.5

Question

Use the Ref to access im The biling point of diethyl ether, cH3cHOCH CH, is 34.50°C at 1 atmosphere A nonvolatile, nonelectrolyte that dissolves in diethyl ether is cholesterol. A student dissolves 10.99 grams of cholesterol, C2H460 (386.6 g/mol), in 181.4 grams of diethyl ether. Use the table of boiling and freezing point constants to answer the questions below Formu la Water H20 0.512 1.86 EthanolCH3CH20H 122 1.99 ChloroformCHCls 3.67 2.53 Diethyl ether CH3CH20CH2CH3 2.02 Benzene CoH 5.12 m. The molality of the solution is oC. The boiling point of the solution is Retry Entire Group 4 more group attempts remaining

Explanation / Answer

1)

Lets calculate molality first

mass(solute)= 10.99 g

use:

number of mol of solute,

n = mass of solute/molar mass of solute

=(10.99 g)/(3.866*10^2 g/mol)

= 2.843*10^-2 mol

m(solvent)= 181.4 g

= 0.1814 kg

use:

Molality,

m = number of mol / mass of solvent in Kg

=(2.843*10^-2 mol)/(0.1814 Kg)

= 0.1567 molal

Answer: 0.157 molal

2)

lets now calculate Tb

Tb = Kb*m

= 2.02*0.1567

= 0.3166 oC

This is increase in boiling point

boiling point of pure liquid = 34.5 oC

So, new boiling point = 34.5 + 0.3166

= 34.8166 oC

Answer: 34.82 oC

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