A chemist working as a safety inspector finds an unmarked bottle in a lab cabine

Question

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of tetrahydrofuran, carbon tetrachloride, pentane, dimethyl sulfoxide, and acetone. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density of tetrahydrofuran 0.89·gcm^3, carbon tetrachloride 1.6·gcm^3, pentane 0.63·gcm^3, dimethyl sulfoxide 1.1·gcm^3, acetone 0.79·gcm^3. Next, the chemist measures the volume of the unknown liquid as 0.852L and the mass of the unknown liquid as 938.g . Calculate the density of the liquid. Be sure your answer has the correct number of significant digits.

Explanation / Answer

A note on the door of the cabinet says the cabinet is used to store bottles of tetrahydrofuran, carbon tetrachloride, pentane, dimethyl sulfoxide, and acetone

Given-

Liquid density of tetrahydrofuran = 0.89·gcm^3

Liquid density of carbon tetrachloride =1.6·gcm^3

Liquid density of pentane = 0.63·gcm^3

Liquid density of dimethyl sulfoxide = 1.1·gcm^3

Liquid density of acetone = 0.79·gcm^3.

Volume of the unknown liquid = 0.852L = 852cm3

Mass of the unknown liquid = 938.g

Density = mass/volume

Density = 938.g /852cm3

Density = 1.10093g/cm3

Density = 1.1gcm^-3 (The correct number of significant digits)

Density of unknown liquid is 1.1gcm^-3 = Liquid density of dimethyl sulfoxide = 1.1·gcm^3

So unknown liquid is dimethyl sulfoxide

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.