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Question

Chemistry Question on Chemical Kinetics

What will be the correct unit of rate constant kk for a reaction whose order is three ?

A

mole −1^{-1} lit sec −1^{-1}

B

mole 2^{2} lit sec −1^{-1}

C

sec −1^{-1}

D

mole −2^{-2} lit 2^{2} sec −1^{-1}

Answer

mole −2^{-2} lit 2^{2} sec −1^{-1}

Explanation

Solution

For third order reaction : Rate =k[A]3=k[A]^{3}
Mol L−1 sec−1=k[Mol L−1]3Mol\, L^{-1}\,sec^{-1}=k[Mol\,L^{-1}]^{3}
K=Mol L−1 sec−1Mol3L−3K=\frac{Mol\,L^{-1}\,sec^{-1}}{Mol^{3}L^{-3}}
=Mol−2 L2 sec−1=Mol^{-2}\,L^{2}\, sec^{-1}