Almost of the mass of the human body is made up of just six elements.
oxygen 65%
carbon 18%
hydrogen 10%
nitrogen 3%
calcium 1.5%
phosphorus 1.0%
find the mass of each element in an human body with a mass of 60 kg.

pl

Step-by-step explanation:

To solve each of these all you have to do is multiply 60kg which is the whole mass of a human body times the percentage so..

Oxygen = (0.65)(60) = 39kg

Carbon = (0.18)(60) = 10.8kg

Hydrogen = (0.10)(60) = 6

Nitrogen = (0.03)(60) = 1.8kg

Calcium = (0.015)(60) = 0.9kg

Phosphorus = (0.01)(60) = 0.6kg

These numbers dont exactly add up to 60 because the percentages gives dont add up to 100%, but this is how to do it.

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation: