(i) k = 2 3 × 10–5 L mol–1 s–1
(ii) k = 3 × 10–4 s–1
(i) The unit of second order rate constant is L mol–1 s–1, therefore
k = 2 3 × 10–5 L mol–1 s–1 represents a second order reaction (ii) The unit of a first order rate constant is s–1 therefore
k = 3 × 10–4 s–1  represents a first order reaction