(a) A first order reaction is 25\; ^{o}/_{o} complete in 40 minutes. Calculate the value of rate constant. In what time will the reaction be 80\; ^{o}/_{o} completed ?

(b) Define order of reaction. Write the condition under which a bimolecular reaction follows first order kinetics.

 

 

Answers (1)

(a) k = (2.303 / t) log ([A]o / [A]t)

k = (2.303 / 40) log (100 / 75)

    = 0.007 min-1 

t = (2.303 / k) log ([A]o / [A]t)

t = (2.303 / 0.0071) log (100/20)

t =230 min

(b) Order of reaction is the Sum of powers of the concentration of the reactants in the rate law expression.

Bimolecular reaction follows first order kinetics when one of the reactant is present in large excess.

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