Chemical Kinetics - Result Question 80

####79. A first order reaction is 20 complete in 10min. Calculate (i) the specific rate constant of the reaction, and

(ii) the time taken for the reaction to go to 75 completion.

(1983, 2M)

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Solution:

  1. For a first order reaction,

kt=ln[A]0[A]

where [A]0= Initial concentration of reactant

[A]= Concentration of reactant remaining 

unreacted at time t.

(i) k=1tln[A]0[A]=110ln10010020=110ln54

=2.303(log52log2)10min1=0.023min1

t=1kln10025=2ln2k=2×0.6930.023=60min



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