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The number of vacancies in some hypothetical metal increases by a factor of 5 when the temperature is increased from 1070 K to 1150 K.

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The number of vacancies in some hypothetical metal increases by a factor of 5 when the temperature is increased from 1070 K to 1150 K. Calculate the energy (in kJ/mol) for vacancy formation assuming that the density of the metal remains the same over this temperature range

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