The time taken to complete the reaction is 179 seconds.
Rate of reaction is the time taken for a reaction to attain completion. From the data presented, we have;
Initial concentration = No
Final concentration = No - (0.8No) = 0.2No
rate constant = 9.2 x 10−3 s−1
time taken = t
Given that;
N =Noe^-kt
0.2No =Noe^-( 9.2 x 10−3 t)
0.2 = e^-( 9.2 x 10−3 t)
ln(0.2) = 9.2 x 10−3 t
t = ln(0.2)/-9.2 x 10−3
t = -1.609/-0.009
t= 179 seconds
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