a.) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg
ID: 1379552 • Letter: A
Question
a.) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in ?g/day .
b.) For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 79kg adult receive?
c.) 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?
d.) The RDA for the trace element selenium is 0.000070 g/day . Express this dose in mg/day .
Explanation / Answer
a) 410mg/day = 410*1000 g/day = 410000 g/day
b) 1000mg = 1 gram
So, hypothetically, if someone weighed 1kg, they would need 12mg of lysine daily.
Then that means, a 72 kg adult would need 864mg of lysine daily, which is 0.864 grams
c) no. of tablets=0.003/0.002=1.5 tablets. Therefore he should take 2 tablets
d) 0.000070g/day=0.070mg/day
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