SELECT * FROM question_mgmt as q WHERE id=1820 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=59 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

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]

Answer:

(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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