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Chapter 1: Q12E (page 59)

(a) The recommended daily allowance (RDA) of the trace metal magnesium is 410mg/day for males. Express this quantity in mg/day. (b) For adults, the RDA of the amino acid lysine is 12mg per kg of body weight. How many grams per day should a 75-kg adult receive? (c) A typical multivitamin tablet can contain 2.0mg of vitamin B2(riboflavin), and the RDA is 0.0030g/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 is0.000070g/day. Express this dose in mg/day.

Short Answer

Expert verified

After the calculation as per given problem a 75 Kg weighed adult can consume 900mg or 0.900grams of Lysine.

Step by step solution

01

Calculation daily trace

410mg/day

=410×1000=410000

02

consumption by 75Kg weighed adult

(b)

1000mg=1gram

So, hypothetically if someone weighed 1Kg they would need 12mg of Lysine daily.

That means , a 75 Kg adult would need 900mg lysine, which is0.900grams.

03

Calculation of number of tablets

( c)

No of tablets =0.003/0.002=1.5 tablets

Therefore, he should take 2 tablets.

04

Conversion

0.000070g/day=0.070mg/day(conversion g to mg )

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