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hymie

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a first order reaction has a fifth life of 20 seconds ( the amount of time needed to use up 1/5)a) Prove that the reaction has a
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i think you made a mistake in the first answer you take ln(100/20) not 100/80 then it will prove it has a constant fifth life
when i chose the next interval of a fifth i did 64 x 1/5 = 12.8 and then i took ln(64/12.8) and that did not give me the same constant as the first two so does this mean that the fifth life is not constant
oh i see 1/5 times 80 is 16 so that is the fifth life of the rxn. for the half life usage should i take 50 seconds using the convenient number of 100 seconds?
how did you get 80 - 16?

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