Physical Chemistry

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Joined: 22 Mar 2012
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5 Apr 2012 20:21:20 IST
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In a first order reaction, concentration of the reactant,decreases from 0.8M TO 0.4M in 15 min. Then
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In a first order reaction, concentration of the reactant,decreases from 0.8M TO 0.4M in 15 min. Then, 0.1M Becomes 0.025M in how many min?



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Hot goIITian

Joined: 4 Apr 2012
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5 Apr 2012 21:23:09 IST
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30 minutes coz two half lifes are spent.................................................................0.8 to 0.4 in 15 minutes=> 0.4 to 0.2 15 min........0.2 to 0.1 in 15 min.............. 0.1 to 0.05 in 15min. , ..........0.05 to 0.025 in 15min.... so in 30 minutes..........
Bipin Dubey's Avatar

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Joined: 23 Jan 2007
Posts: 7958
5 Apr 2012 22:26:41 IST
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0.8M becomes 0.4M in 15 min so half life is 15 min

   where n is no. of half lives

So required time is 2x15 = 30 min




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