Tuesday, June 26, 2018

kinetics - Is half life for first order is depend on the stochiometric coefficient of reactant or product?



enter image description here I took k=6.93x10^(-2) as given in ques and use the half life formula for 1st order kinetics and solve and finally get 10 min as a ans but right ans is 5 min and i m not able to get that..... Plse tell where i m doing mistake??




Answer



If the reaction has the form aAB+C then the rate at which B and C are produced is 1/a of the rate at which A disappears, thus 1adAdt=dBdt=dCdt=kA


On this basis the half-life should be 5 minutes in your question.


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