Neco 2022 Chemistry Question 5

Practice objective / multiple choice question 5 from the 2022 Neco Chemistry examination.

Neco 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 5 NECO • 2022 • CHEMISTRY • objective

A 2.00 g sample of a non‑volatile solute is dissolved in 100.0 g of water. The freezing point of the solution is lowered by 0.74 °C. (i) Calculate the molar mass of the solute. (ii) Using the same solute, predict the freezing‑point depression when it is dissolved in 50.0 g of benzene (freezing point -5.5 °C, \(K_f\) = 5.12 °C·kg mol⁻¹). Give the new freezing point of the benzene solution.

Answer Options

Correct Answer A. Molar mass ≈ 50.3 g mol⁻¹; freezing point of the benzene solution ≈ -9.6 °C.
B. Molar mass ≈ 55.0 g mol⁻¹; freezing point of the benzene solution ≈ -10.8 °C.
C. Molar mass ≈ 60.1 g mol⁻¹; freezing point of the benzene solution ≈ -7.5 °C.
D. Molar mass ≈ 45.2 g mol⁻¹; freezing point of the benzene solution ≈ -8.3 °C.
Correct Answer
A
Correct Option:
Molar mass ≈ 50.3 g mol⁻¹; freezing point of the benzene solution ≈ -9.6 °C.

About This Question

This is Neco 2022 Chemistry Question 5. It is one of the objective questions from the 2022 Neco Chemistry examination.

Difficulty level: Medium .

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