The natural abundances of elements in the human body, expressed as percent by mass, are: oxygen (O),65 percent; carbon \((\mathrm{C}), 18\) percent; hydrogen (H), 10 percent; nitrogen (N), 3 percent; calcium (Ca), 1.6 percent; phosphorus ( \(\mathrm{P}\) ), 1.2 percent; all other elements, 1.2 percent. Calculate the mass in grams of each element in the body of a \(62-\mathrm{kg}\) person.

The human body is an intricate system comprised of various elements, each playing a vital role in sustaining life. The major constituents include oxygen, carbon, hydrogen, and nitrogen, which form the building blocks of cells and are involved in numerous biological processes such as respiration, energy storage, and DNA synthesis.

In the context of our exercise, the human body's elemental composition is expressed as percent by mass which refers to the weight of the element in relation to the entire body weight. Understanding these percentages is essential for several practical applications, including nutrition, pharmacology, and the design of medical diagnostics.

Stoichiometry is rooted in the laws of conservation of mass and constant proportions, central tenets in chemistry that describe how matter is conserved in reactions and how elements combine in fixed ratios to form compounds. This chemistry branch deals with the quantitative relationships between reactants and products in chemical reactions.

In our exercise, stoichiometry doesn't involve a reaction, but rather the calculation of mass based on known percentages, a fundamental stoichiometric skill in quantitative analysis. It is the mathematical representation of the element composition by mass in a 62-kg person. By mastering stoichiometry, students can predict the outcomes of reactions and determine the necessary quantities of substances required for any chemical process.

Chemical composition analysis is an essential process in various scientific fields that involves determining the identity and proportion of the elemental components within a substance. This can be achieved through a variety of techniques, ranging from simple mass measurements to sophisticated instrumental methods such as spectroscopy or chromatography.

In this case, the exercise requires a simple calculation to analyze the percentage composition of the human body. It represents a foundational concept for more complex analytical techniques used in research and industry, to ensure quality control, comply with regulatory standards, and improve product development.