1
From the rate expression for the following reactions, determine their
order of reaction and the dimensions of the rate constants (i) 3NO(g) ® N2O (g)
Rate = k[NO]2
(ii) H2O2 (aq) + 3I– (aq) + 2H+ ® 2H2O (l) + 
3I
Rate = k[H2O2][I-]
(iii) CH3CHO (g) ® CH4 (g) + CO(g)
Rate = k [CH3CHO]3/2
(iv) C2H5Cl (g) ® C2H4 (g) + HCl (g)
Rate = k [C2H5Cl]
3 2
For the reaction:
2A + B ® A2B
the rate = k[A][B]2 with k = 2 0 × 10–6 mol–2 L2 s–1