Class 12 Chemistry - Chapter Chemical Kinetics NCERT Solutions | From the rate expression for the followi
From the rate expression for the following reactions, determine their order of reaction and the dimensions of the rate constants.
(i) 3 NO(g) → N2O(g) Rate = k[NO]2
(ii) H2O2 (aq) + 3 I - (aq) + 2 H+→ 2 H2O (l) + I3- 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]
(i) Given rate = k [NO]2
Therefore, order of the reaction = 2
Dimension of k = Rate / [NO]2
= mol L-1 s-1 / (mol L-1)2
= mol L-1 s-1 / mol2 L-2
= L mol-1 s-1
(ii) Given rate = k [H2O2][I - ]
Therefore, order of the reaction = 2
Dimension of k = Rate / [H2O2][I - ]
= mol L-1 s-1 / (mol L-1) (mol L-1)
= L mol-1 s-1
(iii) Given rate =k [CH3CHO]3/2
Therefore, order of reaction = 3/2
Dimension of k = Rate / [CH3CHO]3/2
= mol L-1 s-1 / (mol L-1)3/2
= mol L-1 s-1 / mol3/2 L-3/2
= L½ mol-½ s-1
(iv) Given rate = k [C2H5Cl]
Therefore,order of the reaction = 1
Dimension of k = Rate / [C2H5Cl]
= mol L-1 s-1 / mol L-1
= s-1
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