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Enthalpy of Solution

57. calculate...

Question

57. calculate bp of solution cntaining 25g urea & 25g thio urea in 500g of chloroform boiling point of pure chloroform is 61.2 degree celsius & Kb = 3.63

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Q. Boiling point of pure chloroform is

61^{\circ} C .

.
On addition of

5.0 g

of a non-volatile solute to

20 g

pure chloroform , the solution boils at

{64.63}^{\circ} C

Ebullioscopic constant K_{b} = 3.63 K k g m o l^{- 1}

Calculate the molecular weight of the solute

Q. Boiling point of chloroform is

61^{\circ} C .

After addition of 5.0 g of a non-volatile solute to 20 g chloroform boils at

{64.63}^{\circ} C .

K_{b} = 3.63 {K kg mol}^{- 1},

what is the molecular weight of the solute?

Q. What would be the molar mass of a compound if

6.21

g of it dissolved in

24.0

g of chloroform form a solution that has a boiling point of

{68.04}^{o}

C. The boiling point of pure chloroform is

{61.7}^{o}

C and the boiling point elevation constant,

K_{b}

for Chloroform is

{3.63}^{o}

Q. The boiling point of pure water is

100^{\circ}

C. Calculate the boiling point of an aqueous solution containing

0.6 g

of urea (molar mass =

60 {g mol}^{- 1}

100 g

K_{b}

0.52 {K kg mol}^{- 1}

.

Q. The boiling point of a solution of

0.512 gm

C_{10} H_{8},

24 gm

of chloroform is

{0.5}^{\circ} C

higher than that of pure chloroform. The molal boiling point elevation constant of chloroform is (in K-kg/mol)

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