Physics

a) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in ?g/s. Express this quantity in 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 75 kg adult receive?. c) A typical multivitamin tablet can contain 2.0 mg of vitamin (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 .

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  1. For your information:
    Major minerals have RDA's (Recommended
    Daily Allowance) of hundreds of milligram (mg) per day. So Magnesium is a major mineral for the human body.
    Note: Iron is the trace mineral with the highest RDA at 10-15 mg/day.

    (a) mg=milligram = (1/1000) gram
    => there are (1/1000) mg/g

    For example,
    15 mg/day = 15 mg * (1/1000) g/mg
    = 15/1000 g = 0.015 g
    (conversion by cancelling the units mg)

    (b) RDA Lysine : 12 mg/kg body weight
    Example:
    For a given adult with 80 kg body weight,
    RDA=12 mg/kg/day *80 kg (kg's cancel)
    =12*80 mg/day
    =960 mg/day

    (c) Vitamin X: RDA=0.0030 g/day
    2 mg/tablet
    RDA=0.0030 g/day
    = 0.0030 g/day * 1000 mg/g (units g cancel)
    =3 mg/day
    =3 mg/day ÷ 2 mg/tablet
    =1.5 tablets/day

    (d) Leave that to you.

    Please work on the above problems and post your answers for a check if you wish.

    Next time, please show your effort by posting at the same time your answers. Be ready to explain how you got your answers to help you correct any misconceptions, if any.

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