The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in g/day.
For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 76 kg adult receive?
A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources?
The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.
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