For the reaction 2A + B rightarrow C, the initial rate was measured at several d

Question

For the reaction 2A + B rightarrow C, the initial rate was measured at several different reactant concentrations. From the tabulated data, determine the rate law for the reaction. a) Rate = k[A][B] b) Rate = k[A]^2 [B] c) Rate = k[A][B]^2 d) Rate = k[A]^2[B]^2 What is the rate constant for the reaction in Question 4? a) 2.8 times 10^2 M^-2 middot s^-1 b) 14 M^-2 middot s^-1 c) 1.4 times 10^2 M^-2 middot s^-1 d) 1.4 times 10^3 M^-2 middot s^-1 The decomposition of Br_2 was followed as a function of time; two different plots of the data are shown here. Determine the order and rate constant for the reaction.

Explanation / Answer

Q4)
consider row 1 and row 2
[A] doublles, [B] does't change but rate doubles
so, order of [A] is 1

consider row 2 and row 3
[A] doublles, [B] doubles but rate becomes 8 times
so, order of [B] is 2

hence,
Rate = K [A][B]^2
Answer: c

Q5)
Rate = K [A][B]^2
put values from row 1
0.035 = K*0.05*(0.05)^2
K = 280 M-2S-1
= 2.80*10^2 M-2.s-1
Answer: a

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