1. (6 pts) H202 decomposes to H30 and O in a reaction tse of a sample constant i

Question

1. (6 pts) H202 decomposes to H30 and O in a reaction tse of a sample constant is 1.06 X 103 min. How long will it take for 15 a reaction that is first order in H202. The rate 2. (8 Br2 order in NO and first order in pts) Ex periments reveal that the reaction shown below is seco 2NO Br22NOBr A. Write the rate equation for the reaction. B. If the concentration of NO is tripled, what is the change in the re at is the effect on reaction rate if the concentration of Br2 is halved? D. What is the rate of appearance of NOBr the instant that the rate of disappearance o mol/L s f Br2 is 4.5

Explanation / Answer

Ans 1

The balanced reaction

H2O2 = H2O + O2

First order reaction

Rate constant k = 1.06*10^-3 min-1

15% of sample is decomposed

Let initial amount [A0] = 100

Final amount remain [A] = 100 - 15 = 85

Time t =?

[A] = [A0] exp (-kt)

85 = 100 x exp(-1.06*10^-3 x t)

ln 0.85 = (-1.06*10^-3 x t)

?0.16252 = -1.06*10^-3 x t

t = 153.32 min

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