Please explain your answer!! (JUST 81&82) Below is a proposed mechanism for the
ID: 869008 • Letter: P
Question
Please explain your answer!! (JUST 81&82)
Below is a proposed mechanism for the decomposition of H2O2. H2O2 +I- rightarrow H2O + IO- slow H2O2 + I?- rightarrow H2O + ?2 +I- fast Which of the following statements is incorrect? The reaction is first-order with respect to [I-]. The reaction is first-order with respect to [H2O2]. IO- is a catalyst. I- is a catalyst. The net reaction is 2H2O2 rightarrow 2H2O + O2. A first-order chemical reaction is observed to have a rate constant of 25 min-1. What is the corresponding half-life for the reaction? 36min 2.4 s 1.7 s 1.7 min 35.8 s For the hypothetical reaction A + 2B rightarrow 2C + D. the initial rate of disappearance of A is 2.0 times 10-2 mol/(L bullet s). What is the initial rate of disappearance of B? 1.4 times 10-1 mol/(L bullet s) 4.0 times 10-4 mol/(L bullet s) 8.0 times 10-2 mol/(L bullet s) 4.0 times 10-2 mol/(L bullet s)Explanation / Answer
81) Half life of a first order rection: t1/2 = 0.693 / k
K is given = 25 min-1
t1/2 = 0.693 / 25 = 0.027 min or 1.7 sec
Correct option is (c)
82) Rate of disappearance of A : -dA/dT = 2 x 10-2 L.s
Rate of disappearance of B : -1/2 dB/dT = 2 x 10-2
dB/dT = 4 x 10-2 L.sec
Correcet option is (d)