What is the mass of phosphorus in a 43 kg person?

What is the mass of phosphorus in a 43 kg person?

The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based on a 70.0 kg person.

Atomic number Element Mass (kg)

8 oxygen 45.2

6 carbon 12.6

1 hydrogen 7.0

7 nitrogen 2.2

20 calcium 1.3

15 phosphorus 0.78

19 potassium 0.25

16 sulfur 0.18

others 0.60

total 70.0 

A: Potassium makes up what fraction of the mass of the human body?

B: Potassium makes up what percentage of the mass of the human body? 

C: What is the mass of phosphorus in a 43 kg person? Answer 

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*****************************************what is A 

For A  use proportion 

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For letter B (percent)

0.25/ 70.0 x 100 = 3.571428571E-1

round or reduce to:

0.36

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For C 

0.78 / 70.0 = 1.1142855714E-2

convert to = 0.0111

mass of phosphorus in a 43 kg person

43 X 0.0111 = 4.77

round or convert to  = 0.48

Update:

question A 

0.25/70= 3.571428571E-3

3.6x10^-3=

3.6E-3

1 Answer

Relevance
  • 1 month ago

    All this looks right. For B, I would express the answer as "0.36%" to distinguish in from a fraction of the mass as in A. Also, you should put units on your answer in C. You have 3.6X10^-3 kg or 3.6 g. Either answer should be fine.

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