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A drug becomes ineffective after 30% dec...

A drug becomes ineffective after `30%` decompoistion. The original concentration of a sample was `5 mg mL^(-1)` which becomes `4.2 mg mL^(-1)` during `20` months. Assuming the decompoistion of first order, calculate the expiry time of the drug in month. What is the half life of the Product?

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expiry time = 41 months
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MOTION-Chemical Kinetics-Exercise - 3
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  9. Show that in case of a first order reaction, the time required for 93....

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