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You are characterizing a new enzyme isolated and purified in the laboratory. If the maximum velocity of the enzyme is $1800 ~\mu$ moles $\mathrm{L}^{-1} \mathrm{~min}^{-1}$ and the total concentration of the enzyme in the reaction mixture is $1.5 ~\mu \mathrm{M}$, then the turnover number of the enzyme is $\_\_\_\_$ $\mathrm{s}^{-1}$. (answer in integer)

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