Calculate the mass in grams of each element in the body of a 57kg person

[mightyhealthy]

Homework Statement

The natural abundaces of elements in the human body, expressed as a percent by mass, are oxygen (o) 65%; carbon (C), 18%; hydrogen (H), 10%; nitrogen (N), 3.0%; calcium (Ca), 1.6%; phosphorous(P), 1.2%; all other elements 1.2%

Calculate the mass in gram of each element in the body of a 57-kg person

Homework Equations

this involves unit conversions 1000grams=1kg
don't know what else

The Attempt at a Solution

i am clueless

 

[Borek]

What does it mean 35% of something?

 

[Blueshift5]

I can provide you with the solution to this problem. First, we need to convert the percentages to decimals by dividing each percentage by 100.

Oxygen (O) = 65% ÷ 100 = 0.65
Carbon (C) = 18% ÷ 100 = 0.18
Hydrogen (H) = 10% ÷ 100 = 0.10
Nitrogen (N) = 3.0% ÷ 100 = 0.03
Calcium (Ca) = 1.6% ÷ 100 = 0.016
Phosphorous (P) = 1.2% ÷ 100 = 0.012
All other elements = 1.2% ÷ 100 = 0.012

Next, we need to calculate the mass of each element in grams by multiplying the decimal by the total mass of the person (57 kg).

Mass of Oxygen (O) = 0.65 x 57 kg = 37.05 kg = 37,050 grams
Mass of Carbon (C) = 0.18 x 57 kg = 10.26 kg = 10,260 grams
Mass of Hydrogen (H) = 0.10 x 57 kg = 5.7 kg = 5,700 grams
Mass of Nitrogen (N) = 0.03 x 57 kg = 1.71 kg = 1,710 grams
Mass of Calcium (Ca) = 0.016 x 57 kg = 0.912 kg = 912 grams
Mass of Phosphorous (P) = 0.012 x 57 kg = 0.684 kg = 684 grams
Mass of all other elements = 0.012 x 57 kg = 0.684 kg = 684 grams

Therefore, the mass of each element in the body of a 57-kg person is:

Oxygen (O) = 37,050 grams
Carbon (C) = 10,260 grams
Hydrogen (H) = 5,700 grams
Nitrogen (N) = 1,710 grams
Calcium (Ca) = 912 grams
Phosphorous (P) = 684 grams
All other elements = 684 grams

I hope this helps you with your homework.