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Q.

The vapour pressure of pure water at 25°C is 30 mm. The vapour pressure of 10% (w/w) glucose solution at 25°C is ____________ (Assuming the solution is dilute )

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a

31.5 mm

b

30.6 mm

c

29.67 mm

d

26.56 mm

answer is C.

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Detailed Solution

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(W/W)% of aq. glucose =10%

\large \begin{array}{l} P_{{H_2}O}^o = 30mm\\ {W_{glu\cos e}}({W_s}) = 10g\\ {W_{{H_2}O}}({W_o}) = (100 - 10) = 90g \end{array}

For very dilute sol.,

\large \frac{{{P^o} - P}}{{{P^o}}} = \frac{{{W_s}}}{{{M_s}}}X\frac{{{M_o}}}{{{W_o}}}       (M=Mol.Wt.)

\large \frac{30-P}{30}=\frac{10}{180}X\frac{18}{90}

P= 29.67mm

VP of sol. of non-volatile solute = 29.67mm

 

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