What is the unit for the rate constant of a second order reaction?

s^{- 1}

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mol

L^{- 1}

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mol

L^{- 1} s^{- 1}

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{m o l}^{- 1} s^{- 1}

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{m o l}^{2} L^{- 2} s^{- 2}

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Solution

The correct option is D L ${m o l}^{- 1} s^{- 1}$
The unit for the rate constant of a second order reaction is $L {m o l}^{- 1} s^{- 1}$ .
For a second order reaction, $r a t e = k [A]^{2}$
$m o l L^{- 1} s^{- 1} = k (m o l L^{- 1})^{2}$
$k = L {m o l}^{- 1} s^{- 1}$

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t_{1 / 2} v / s [R]_{0}

What do you understand by the 'order of a reaction'? Identify the reaction order from each of the following units of reaction rate constant:

(i) $L^{- 1} m o l s^{- 1}$

(ii) $L m o l^{- 1} s^{- 1}$

2 A + B \to P,

t_{\frac{1}{2}}

m o l L^{- 1} s^{- 1}

9.1 \times 10^{- 6} m o l L^{- 1} s^{- 1}

0.01 m o l L^{- 1}

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