What is the rate of decomposition of chromate ion (CrO_4^2-) if the rate of the

Question

What is the rate of decomposition of chromate ion (CrO_4^2-) if the rate of the formation of dichromate ions (Cr_2O_2^2-)_13 0.03 Ms^-1? 2CrO_4^2-(ag) + 2H^+(ag) rightarrow Cr_2O_2^2-(ag) + H_2O(e) A. 0.15 M.s^-1 B. 0.03M.s^-1 C. 0.60 M.s^-1 D. 1.20 M.s^-1 The table gives initial rates for the reaction 2A + B rightarrow C + D what is the rate for the reaction? A. Rate - K[A][B] B. Rate - K[A][B]^2 C. Rate - K[A]^2 [B] D. Rate - K[A]^2[B]^2 Ozone NO_2 + 2NO_2 + O_2 rightarrow N_2O_3 + O_2 + of ozone in the atomic ___ + O_3 rightarrow NO_3 + )_2(slow) ____ + NO_2 rightarrow N_2 O_3(fast) A. B. Rate - K[NO_2]^2[O_3] C. D. Rate - K[NO_3][O_2]

Explanation / Answer

38)

from given reaction,

rate of reaction can be defined as,

rate of reaction = (1/2)*rate of decomposition of chromate ion = rate of formation of dichromate ion

so,

(1/2)*rate of decomposition of chromate ion = rate of formation of dichromate ion

(1/2)*rate of decomposition of chromate ion = 0.30 M.s-1

rate of decomposition of chromate ion = 0.60 M.s-1

Answer: 0.60 M.s-1

#39)

see experiment 1 and 2:

[A] doubles

[B] is constant

rate doubles

so, oder of A is 1

see experiment 2 and 4:

[A] is constant

[B] becomes 3 times

rate becomes 1.1*10^-1 / (1.2*10^-2) = 9 times

so, oder of B is 2

rate law is:

rate = k [A] [B]^2

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