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The number of vacancies in some metal at 879 C is 1.9 x 1024 m3. Calculate the number of vacancies at 646 C given that

The number of vacancies in some metal at 879 C is 1.9 x 1024 m3. Calculate the number of vacancies at 646 C given that the energy of vacancy formation is 1.09 ev/atom ; assume the density at both temperatures is the same.

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