Question

What is the boiling point elevation of a solution containing 245 grams of non-electrolyte sucrose (molar mass=342 g/mole) in 822g of water?

Answer 1

Correct option is A)

Number of moles of sucrose is the ratio of mass to molar mass.

n=

342

68.4

=0.2 moles

Molality of solution is the ratio of the number of moles of sucrose to the volume of water (in kg) is

m=

0.1

0.2

=2

The elevation in the boiling point of the solution is

ΔT

b

=K

b

m=0.512×2=1.024

o

C

The boiling point of the solution is 100+1.024=101.02

o

C

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