Chapter 1, Problem 58RGQ

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# There are five hydrocarbon compounds (compounds of C and II) that have the formula C6H14. (These are isomers; they differ in the way that C and H atoms are attached. Chapter 23) All are liquids at room temperature but have slightly different densities.(a) You have a pure sample of one of these hydrocarbons, and to identify it you decide to measure its density. You determine that a 5.0-mL sample (measured in a graduated cylinder) has a mass of 3.2745 g (measured on an analytical balance). Assume that the accuracy of the values for mass and volume is plus or minus one (± 1) in the last significant figure. What is the density of the liquid?(b) Can you identify the unknown hydrocarbon based on your experiment?(c) Can you eliminate any of the five possibilities based on the data? If so, which one(s)?(d) You need a more accurate volume measurement to solve this problem, and you redetermine the volume to be 4.93 mL Based on this new informationwhat is the unknown compound?

(a)

Interpretation Introduction

Interpretation: The density of the liquid has to be given.

Concept Introduction:

Density: A measurement of mass per unit volume.

Density = Mass volume

Explanation

The density is calculated as,

â€‚Â DensityÂ =Â MassÂ volumeGiven:â€‰VolumeÂ =â€‰5.0Â mlÂ ;Â MassÂ Â =Â 3.2745Â g;DensityÂ =Â 3

(b)

Interpretation Introduction

Interpretation: The unknown hydrocarbon has to be identified.

(c)

Interpretation Introduction

Interpretation: Any of the five possibilities based on the data that can be eliminated has to be given.

(d)

Interpretation Introduction

Interpretation: The unknown compound has to be given.

Concept Introduction:

Density: A measurement of mass per unit volume.

Density = Mass volume

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