Answered: A certain liquid X has a normal boiling…

Introductory Chemistry: An Active Learning Approach

6th Edition

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Mark S. Cracolice, Ed Peters

Chapter3: Measurement And Chemical Calculations

Section: Chapter Questions

Problem 64E: Exactly 1 liter of a solution contains 31.4 grams of a certain dissolved substance. What mass in...

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A certain liquid X has a normal boiling point of 146.10°C and a boiling point elevation constant =Kb1.88·°C·kgmol−1. A solution is prepared by dissolving some urea (CH4N2O) in 400.g of X. This solution boils at 149.5°C. Calculate the mass of CH4N2O that was dissolved. Round your answer to 2 significant digits. = ___g

Expert Solution

Data given:

Normal boiling point of the liquid, $T_{b} °$ = 146.10 ^oC

Elevated boiling point of the liquid, $T_{b}$ = 149.5 ^oC

Elevation in the boiling point, $∆ T_{b}$ = $T_{b} -$ $T_{b} °$ = 3.4 ^oC

Ebulliscopic or boiling point elevation constant (K_b) = 1.88 ^oC Kg mol^-1

Mass of the solvent X = 400 g or 0.4 Kg

Conversion factor:

1000 g = 1 Kg

1 g = $\frac{1}{1000}$ Kg

400 g = $\frac{400}{1000} K g = 0.4 K g$

Molar mass of CH₄N₂O = $(12 + 4 \times 1 + 2 \times 14 + 16) g m o l^{- 1}$ = 60 g mol^-1

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