3. The freezing point of pure naphthalene is 80.1 C. Determine the paint mass of benzene dissolved in naphthalene if, when 0.4 cm3 is added to 10 g of naphthalene, the freezing point of the solution is 77.01 C. The heat of melting of naphthalene is 148.7 J / g, the density of benzene is 0.879 g/cm3.

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