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Define half life of reaction . Shows that the first order reaction half life is independent of Intel concentration. |
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Answer» Solution :Half life of reaction is defined as the time REQUIRED for the REACTANT concentration to each one half of its INITIAL value. For a first ORDER reaction , the half Life is a CONSTANT i.e, it does not depend on the initial concentration. The rate constant for a first order reaction is given by, `k=(2.303)/t=log.([A]_0)/([A])` at `t=t_(1//2),[A]=[A_0]//2` `:.k=(2.303)/(t_(1//2))log.([A_0])/([A_0]//2)` `k=(2.303xx0.3010)/(t_(1//2))=(0.6932)/(t_(1//2))` `t_(1//2)=(0.6932)/k` |
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