Question

Boiling point of water at 750 mm is 96.63°C. How
much sucrose is to be added to 500g of water such
that it boils at 100°C ? Kb = 0.52 K kg/mol.​

Answer 1

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Answer 2

Given, △T

b

=100−99.63=0.37

o

;K

b

=0.52

Mass of water =500 g

Let x gm of sucrose be added.

Molar mass of sucrose =342 g mol

−1

Molality (M)=

342×500

x×1000

=

171

x

△T

b

=K

b

×m

0.37=0.52×

171

x

x=121.67 gm

Therefore, 121.67 gm of sucrose must be added.