Answer :
the boiling point of a solution made of of urea 136.52°c
Calculation :
Mass of urea is 76.0 g
Molar mass of urea is 60.06 g/mol
number of moles of urea = 76g*(mol/60.06 g) =1.27 mol
Mass of solvent = 850.0g*(Ikg/1000)=0.850 kg
Molality of solvent = 1.27 mol/0.850kg=1.49 m
Molality of the solution=3.26m
Use the following equation to calculate boiling point of the solution:
ΔT, =Kb x m
K, of solvent is 136°C /m
Boling point of solvent, T, =134.5°C
Therefore,
ΔT, =Kb x m
=136°C/m x 149 m
=2.02°C
= Tsolution = Tsolvent + ΔTb
Tsotution =134.5°C+2.02 °C
T, =136.52 °C
Hence, the boliling point of the solution is 136.52°c
The boiling point of a liquid changes with pressure. The normal boiling point is the temperature at which the vapor pressure equals normal atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). At sea level, water boils at 100°C (212°F).
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