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For a drug to be effective in treating an illness, its levels in the bloodstream must...

For a drug to be effective in treating an illness, its levels in the bloodstream must be maintained for a period of time. One way to measure the level of a drug in the body is to measure its rate of appearance in the urine. The rate of excretion of penicillin is first order, with a half-life of about 30. min. If a person receives an injection of 37 mg of penicillin at  = 0, how much penicillin remains in the body after 3.0 hours?

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tir For 1st order reaction ln Co. ln 2 xt Co- eritied non c- find +1/2 = half life t = 3 hows - 3x60 min - 180 mi my t = tim

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