Neco 2020 Chemistry Question 3

Practice objective / multiple choice question 3 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Medium Difficulty
Question 3 NECO • 2020 • CHEMISTRY • objective

A solution is prepared by dissolving 0.500 mol of a non‑volatile solute in 1.00 kg of water at 25 °C. The vapour pressure of pure water at this temperature is 23.8 mmHg. Using Raoult's law, determine the vapour pressure of the solution. Then, calculate the boiling‑point elevation of the solution, given the ebullioscopic constant of water \(K_{b}=0.512\,^{\circ}C·kg·mol^{-1}\). Assume the normal boiling point of water is 100 °C.

Answer Options

Correct Answer A. Vapour pressure = 23.6 mmHg; boiling point = 100.3 °C
B. Vapour pressure = 23.5 mmHg; boiling point = 100.1 °C
C. Vapour pressure = 23.4 mmHg; boiling point = 100.2 °C
D. Vapour pressure = 23.8 mmHg; boiling point = 100.0 °C
Correct Answer
A
Correct Option:
Vapour pressure = 23.6 mmHg; boiling point = 100.3 °C

About This Question

This is Neco 2020 Chemistry Question 3. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Medium .

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