Neco 2018 Chemistry Question 18

Practice objective / multiple choice question 18 from the 2018 Neco Chemistry examination.

Neco 2018 Chemistry Objective / Multiple Choice Medium Difficulty
Question 18 NECO • 2018 • CHEMISTRY • objective

A 3.71 g sample of an unknown alcohol is dissolved in 100.0 g of water. The freezing point of the solution is lowered by 0.93°C. Given that the cryoscopic constant of water is \(K_{f}=1.86\;^{\circ}\text{C·kg·mol}^{-1}\), determine the molar mass of the alcohol and, from the list \{methanol, ethanol, propanol, butanol, pentanol\}, identify the most likely alcohol.

Answer Options

A. Molar mass ≈ 32 g·mol⁻¹; likely methanol (CH₄O)
Correct Answer B. Molar mass ≈ 74 g·mol⁻¹; likely butanol (C₄H₁₀O)
C. Molar mass ≈ 46 g·mol⁻¹; likely ethanol (C₂H₆O)
D. Molar mass ≈ 88 g·mol⁻¹; likely pentanol (C₅H₁₂O)
Correct Answer
B
Correct Option:
Molar mass ≈ 74 g·mol⁻¹; likely butanol (C₄H₁₀O)

About This Question

This is Neco 2018 Chemistry Question 18. It is one of the objective questions from the 2018 Neco Chemistry examination.

Difficulty level: Medium .

View More Neco 2018 Chemistry Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support