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 hote on t le dar?he cabinet says he cabine, ethanolamine, chloroform, pentane, dimethyl sulfoxide, and tetrahydrofuran. used to tore bones i The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: alo uid densit 1.0-8 Ar chloroform 1.5 pentane 0.63 dimethyl sulfoxide 1.1- tetrahydrofuran 0.89 cm cm cin cm Next, the chemist measures the volume of the unknown liquid as 0.506 L and the mass of the unknown liquid as 317. g Calculate the density of the liquid. Be sure your answer has the correct number of 8 cm Given the data above, is it possible to identifyl O yes the liquid? O no ethanolamine chloroform i i is possible to identifly the ligquid, do so. dimethyl suitoxide tetrahydrofuran Submit Assignment ll Education Al Rights Reserved Terms of Use |Privecy

Explanation / Answer

Given that

Mass of unknown liquid = 317 g

Volume of unknown liquid = 0.506 L x 1000cm3/1L

= 506 cm3

Density of liquid = mass/volume

= (317 g) / (506 cm3)

= 0.626 g/cm3

Yes, it is possible to identify the liquid.

Density of pentane = 0.63 g/cm3

Our calculated density of unknown liquid = 0.626 g/cm3

For 2 sig figs

calculated density of unknown liquid = 0.63 g/cm3

Unknown liquid is pentane

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