The antibiotic tetracycline has the formula C22H24N2O8. Safe dosage of the drug is 0.24 mol/kg/day. If a child weighing 45 lb is administered tetracycline in four equally divided doses per day, what mass of tetracycline should be present in each dos

543.72 g

Explanation:

First we convert 45 lb to kg:

Then we calculate how many tetracycline moles need to be administered each day, given the child's mass:

We divide that amount by the number of doses per day:

Finally we convert 1.2246 tetracycline moles to grams, using its molar mass:

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the answer for sodium is 0.186

the answer for rubidium is 0.251