Question

the mixture of n-hexane and n-heptane is an example of:

Answer 1

 

Experiment 7Distillation of a Mixture of

n

-Hexane and

n

-Heptane

 

 Note: This laboratory will be conducted in the new chemistrybuilding in labs 121 and 127. Go directly there at the start of your scheduled lab section on Tuesday.

Introduction

The goal of this experiment is to carry out a simple distillation of a liquid binarymixture of two organic substances,

n

-hexane and

n

-heptane, analyze the contents ofsamples collected from both the liquid and vapor phase during the distillation, and createa liquid - vapor composition diagram similar to Figure 6.17 in Oxtoby. Hexane andheptane are straight chain hydrocarbons containing six and seven carbon atoms and aremajor constituents of gasoline. To a reasonable degree such hydrocarbons behave as ideal binary mixtures: (a) their gas - liquid equilibria can be described by Raoult's law, (b) theyobey Dalton's law of partial pressures, and (c) their vapor pressures as a function oftemperature can be approximated by the Clausius - Clapeyron equation.The original mixture prepared for distillation is 80% by volume hexane and 20% byvolume heptane. The basic procedure you will be performing in this laboratory is asfollows. During the course of the distillation at preselected temperature intervals, youwill collect a pair of samples. Each pair will consist of one sample of approximately 0.5ml from the boiling flask, and one sample of approximately 0.5 ml from the end of thecondenser. At the same time you will record the temperature of the. After the distillationhas finished, you will determine the composition of the liquid and condensed vaporsamples by the technique of gas chromatography (GC). For each sample, there will betwo peaks, the first from the

n

-hexane and the second from the

n

-heptane. By running astandard mixture of

n

-hexane and

n

-heptane, you can determine separate response factorsthat relate peak height to moles of each compound. Using a ratio method, you can convertthese values to mole fractions in the sample.You will tabulate the data and present a graphical temperature - composition diagram for

n

-hexane /

n

-heptane pair

Answer 2

Answer:

The mixture of n-hexane and n-heptane is an example of ideal solution.

Explanation:

Conditions of an ideal solution?

• It obeys Raoult's law at all concentrations and temperatures.
• No energy should evolve or be absorbed. So, the enthalpy (ΔHmix = 0) of the energy should be zero.
• On mixing, there should be no expansion or contraction in the volume of the solution. So, the enthalpy (ΔVmix = 0) of the volume should be zero.
• Examples of such solutions are n-hexane + n-heptane, benzene + toluene, chlorobenzene + bromobenzene, ethyl-iodide + ethyl-bromide, etc.

So, from the above discussion, it is proved that the mixture of n-hexane and n-heptane is an example of an ideal solution.

To learn more about the Raoult's law,

https://brainly.in/question/20638847

To learn more about the non ideal solution,

https://brainly.in/question/8824044

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