$600C{10}^{-15}\frac{m^2}{s}900C{10}^{-22}\frac{m^2}{s}$

$at600C$ and ${10}^{-15}\frac{m^2}{s}at900C.$

Part $A$

Calculate the activation energy for the diffusion $of$ nickel $in$ this alloy over this temperature range.

Express your answer $in$ kilojoules per mole $to$ three significant figures.