Homework Answers
ln A = -kt + ln Ao
k = rate constant
t = time
Ao = Initial concentration
A = concentration at time t
Let us find rate constant using the values
ln 0.25 = - k 320 + ln 1
k = 0.004332 sec-1
Now let us calculate the haf life
half life = 0.693 / k
First Half Life = 0.693 / 0.004332 = 159.96 Seconds
Second Half Life = 2 x 770.85 = 319.93 Seconds
time to complete 90% reaction
ln 0.1 = -0.004332 x t + ln 1
t = 531.5 seconds
It will take 531.5 seconds to complete 90% of the reaction
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