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(B) The rate of dissociation is constant: $10\% 	ext{ per hour}$.Since the amount of reactant dissociated is directly proportional to time,the reacti

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$mol \ L^{-1} \ hour^{-1}$

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(B) The rate of dissociation is constant: $10\% 	ext{ per hour}$.Since the amount of reactant dissociated is directly proportional to time,the reaction follows zero-order kinetics.For a zero-order reaction,the rate law is $[R] = [R]_0 - Kt$,which implies $x = Kt$,where $x$ is the concentration of reactant dissociated.The rate constant $K$ has the same units as the rate of reaction,which is $	ext{concentration} 	imes 	ext{time}^{-1}$.Therefore,the unit is $mol \ L^{-1} \ hour^{-1}$.

For a certain reaction,$10\%$ of the reactant dissociates in $1 \ hour$,$20\%$ of the reactant dissociates in $2 \ hour$,and $30\%$ of the reactant dissociates in $3 \ hour$. What are the units of the rate constant?

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