Neco 2019 Chemistry Question 17

Practice objective / multiple choice question 17 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 17 NECO • 2019 • CHEMISTRY • objective

A 100 g mixture of benzene (M = 78.11 g·mol\(^{-1}\)) and toluene (M = 92.14 g·mol\(^{-1}\)) has a density of 0.88 g·mL\(^{-1}\). At 25\(^\circ\)C the total vapour pressure above the mixture is measured to be 0.45 atm. The vapour pressures of the pure components at this temperature are 0.55 atm for benzene and 0.28 atm for toluene. Assuming the mixture behaves as an ideal solution (Raoult's law), (a) determine the mole fraction of benzene in the liquid phase, and (b) calculate the mass of benzene present in the mixture.

Answer Options

A. x_{B}=0.55 (≈) and mass of benzene = 5.2\\times10^{1}\\,\\text{g}
Correct Answer B. x_{B}=0.63 (≈) and mass of benzene = 5.9\times10^{1}\,\text{g}
C. x_{B}=0.60 (≈) and mass of benzene = 5.8\\times10^{1}\\,\\text{g}
D. x_{B}=0.70 (≈) and mass of benzene = 6.4\\times10^{1}\\,\\text{g}
Correct Answer
B
Correct Option:
x_{B}=0.63 (≈) and mass of benzene = 5.9\times10^{1}\,\text{g}

About This Question

This is Neco 2019 Chemistry Question 17. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Medium .

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