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Enthalpy of Solution

The freezing ...

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The freezing point of aqueous solution containing20% w/w urea and 20% w/w NaOH also, will be(if K, of H2O is 1.8 K kg mol-')

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Q. Freezing point of a

5 % (w / w)

aqueous solution of

X

is equal to freezing point of

20 % (w / w)

aqueous solution of

Y

. If molecular weight of

X

A

, then molecular weight of

Y

Van't Hoff factor, i, of a 0.5% (w/w) aqueous solution of KCl which freezes at

- {0.24}^{o} C

[K_{f}

of water = 1.86 K kg mol

^{- 1}

, Mol.wt.of KCl = 74.5]

Q. Calculate mole fraction of solute if molarity of solution is 20% (

\frac{W}{W}

) aqueous solution of NaOH.

Q. Van't Hoff factor, (i), of a

0.5 %

(w/W) aqueous solution of

K C l

which freezes at

- {0.24}^{o}

K_{f}

= 1.86

m o l^{- 1}

, molecular weight of

K C l

= 74.5

5

% solution (w/W) of cane sugar (molar mass

= 342 g

{m o l}^{- 1}

) has freezing point

271 K

. What will be the freezing point of

5

% glucose (molar mass

= 18 g

{m o l}^{- 1}

) in water if freezing point of pure water is

273.15 K

?

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