When $[H_2] = [NO] = 1\ mol\,dm^{-3}$ the rate is $0.024\ mol\,dm^{-3}\,s^{-1}$ and rate $= k[H_2][NO]^2$ . The rate constant is

0.024\ s^{-1}

0.024\ mol^{-1}dm^3s^{-1}

0.024\ mol\,dm^{-3}s^{-1}

0.024\ mol^{-2}dm^6s^{-1}

Explanation: For an overall third order reaction the units of

k

are

mol^{-2}dm^6s^{-1}

Derived from ZIMSEC Chemistry Paper 2, November 2008, Q2

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