We wish to purify (99.81 mathrm{wt} %) anthracene to (99.96 mathrm{wt} %). The only impurity is fluorene.

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We wish to purify \(99.81 \mathrm{wt} \%\) anthracene to \(99.96 \mathrm{wt} \%\). The only impurity is fluorene. Assume equilibrium operation.

a. Will one pass in a zone refiner with \(\mathrm{L} / l=10, \mathrm{~L}=0.2 \mathrm{~m}\), and \(\mathrm{z}_{\text {cut }}\) at \(0.75 \mathrm{~L}\) do the required separation? If not, what is the average anthracene purity?

b. If normal freezing is done and \(75 \%\) of the anthracene bar is frozen, is the required average purity obtained? What is the average crystal concentration?

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