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Chapter 1: 12 (page 28)

(a) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in 碌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 75-kg 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, if he gets none from other sources? (d) The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.

Short Answer

Expert verified

(a) The given quantity in 碌g/day is 410000 碌g/day.

(b) The required quantity for 75 kg person is 0.9 g.

(c) The required number of tablets is 1.5.

(d) The conversion in mg/day is 0.07 mg/day.

Step by step solution

01

The conversion is µg/day

Part (a)

The conversion in 碌g/day is shown below,

410mg/day=410mgday脳1000渭g1mg=410000渭g/day

Thus, the given quantity in 碌g/day is 410000 碌g/day.

02

Consumption of amino acid lysine

Part (b)

The amount of amino acid lysine for 75 kg person can be calculated as,

=12mgkg脳1g1000mg脳75kg=0.9g

Thus, the required quantity for 75 kg person is 0.9 g.

03

Calculation of number of tablets

Part (c)

The number of tablets can be calculated as,

0.003gday2mgday脳1g1000mg=1.5

Thus, the required number of tablets is 1.5.

04

The conversion in mg/day

The conversion in mg/day is shown below,

0.000070g/day=0.000070gday脳1000mg1g=0.07mg/day

Thus, the conversion in mg/day is 0.07 mg/day.

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