81. From the benzene-naphthalene fusibility diagram, determine:
1) in what temperature range does a solution with a concentration of 0.6 mole fraction of C10H8 crystallize?
2) how the composition of the equilibrium phases changes during the crystallization of the solution indicated in paragraph 1.
3) the number of equilibrium phases of the solution specified in paragraph 1, at T=300K, if the total amount of the mixture is 100g.

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