$\begin{array}{1 1} M^{\large\frac{1-n}{n}} s^{âˆ’1} \\ M^{n-1} s^{âˆ’1} \\ M s^{âˆ’1} \\ M^{1-n} s^{âˆ’1} \end{array}$

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Answer: M$^{1-n}$ s$^{−1}$

The units of the rate constant depend on the global order of reaction: If concentration is measured in units of mol·L$^{−1}$ (sometimes abbreviated as M), then:

For order one, the rate coefficient has units of s$^{−1}$, which can be written as M$^{1-1}$ s$^{−1}$

For order two, the rate coefficient has units of M$^{-1}$s$^{−1}$, which can be written as M$^{1-2}$ s$^{−1}$

For order three, the rate coefficient has units of M$^{-2}$s$^{−1}$, which can be written as M$^{1-3}$ s$^{−1}$

Generalising for order n, the rate coefficient will have units of M$^{1-n}$ s$^{−1}$

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