On the basis of electrical measurements, it is concluded that the equilibrium vacancy concentration in a given metal is two orders of magnitude higher at 807 C than at 498 C. What is the energy of vacancy formation (ΔHv in kJ/mol) for this metal?

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  1. two orders of magnitude mean 10^2 = 100

    so use the following ratio in the Arrhenius Equation for Enthalphy of vacancy

    ln(100) = Hv / R (1/T1 - 1/T2)

    Make sure that you use R = 8.314 J/molK
    T1 = lower temperature convert that to Kelvin
    T2 = higher Temperature

    The final answer will be in J/mol
    So convert it to KJ/mol


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