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The unit of the rate constant of a second order reaction, with concentration in $mol L^{- 1}$ and time in seconds, is

A $s^{- 1}$
B $L mo l^{- 1} s^{- 1}$
C $mol L^{- 1} s^{- 1}$
D $L^{2} mo l^{- 2} s^{- 1}$

Answer: B

For rate =

k [A]^{2}

,

k = rate / [A]^{2}

has units

mol L^{- 1} s^{- 1} / mo l^{2} L^{- 2} = L mo l^{- 1} s^{- 1}

.

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