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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Chemical kinetics
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[Post New]30 Apr 2008 19:00:21 IST
    Subject: Chemical kinetics
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ssbrightstar1 (5)

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A first order reaction takes 40 minutes for 30% decomposition.Calculate t1/2.
    
[Post New]30 Apr 2008 19:15:53 IST
    Subject: Re:Chemical kinetics
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allamraju (3422)

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According to given condition,40=1/kln(a/7a/10)=1/kln(10/7)

so,t1/2=ln2/k=40ln2/ln(10/7).simplifying this gives the ans which I think is approximately 75.2min.
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[Post New]30 Apr 2008 19:25:08 IST
    Subject: Re:Chemical kinetics
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Nithy (400)

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ya just use


formulas t= 2.303 / k *log(initial conc / final  remaining)


remailing is 70% orig


 


and t1/2 = .693/k
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