3. Calculate the work of formation of nuclei of critical size in nickel and copper melts when cooling them from the melting point to a temperature of 800 C. The melting point of copper is 1083 C, nickel 1455 C. The specific heat of fusion of copper is 2688 cal/mol, nickel 4200 cal/mol, the density of the copper melt is 830 kg/m3, nickel 7800 kg/m3; the surface tension of copper melts is 11.2 N/m, nickel - 1.7 N/m.

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