a)For the reaction A ? B + C when [A] is plotted versus the time in minutes a st

Question

a)For the reaction A ? B + C when [A] is plotted versus the time in minutes a straight line is obtained whose slope is -0.021 M/min. What is the concentration of A (in M) after 38.00 min if [A]o = 0.90 M?

b)For the reaction A ? B + C, when the natural log of [A] is plotted versus the time in seconds a straight line is obtained whose slope is -0.037 s-1. What is the concentration of A (in M) after 58.0 s if [A]o = 0.90 M?

c)For a second order reaction, the initial reactant concentration, [A]o, is 0.94 M. After 11.7 s, the concentration is 0.59 M. What is [A] after 80 s?

d)For a first order reaction, the initial reactant concentration, [A]o, is 0.81 M. After 16.5 s, the concentration is 0.62 M. What is [A] after 66 s?

Explanation / Answer

1)from the given data K1=0.021M/min

K1= 2.303/t log (a/a-x)

0.021=2.303/38 log(0.9/a-x)

(0.9/a-x) =2.238

(a-x) = 0.9/2.238

remaining A conc. =0.402 M/min

2) in a 0 order reactions

x=Kot

a-(a-x)/t =K

0.9-(a-x)/50 =0.037

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