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The desorption (leaving of the surface) of a single molecular
layer of n-butane from a single crystal of aluminum oxide is
found to be first order with a rate constant of 0.128>s at 150 K.
b. If the surface is initially completely covered with n-butane
at 150 K, how long will it take for 25% of the molecules to
desorb (leave the surface)? For 50% to desorb?