The natural abundances of elements in the human body, expressed as percent by mass, are oxygen (o), 65 percent; carbon (c), 18 percent; hydrogen (h), 10 percent; nitrogen (n), 3 percent; calcium (ca), 1.6 percent; phosphorus(p), 1.2 percent; all other elements, 1.2 percent. calculate the mass in grams of each element in the body of a 62-kg person.

The mass of oxygen is 40300 g, hydrogen is 11160 g, nitrogen is 6200 g, calcium is 1860 g, phosphorus is 992 g and other elements is 744 g in the body of 62 kg person.

Explanation:

We are given:

Mass of body = 62 kg = 62000 g   (Conversion factor: 1 kg = 1000 g)

Mass percent of oxygen = 65 %

This means that 65 grams of oxygen is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of oxygen present is 65 grams.

So, in 62000 grams of human body, the mass of oxygen present will be =

Mass of oxygen present = 40300 g

Mass percent of hydrogen = 18 %

This means that 18 grams of hydrogen is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of hydrogen present is 18 grams.

So, in 62000 grams of human body, the mass of hydrogen present will be =

Mass of hydrogen present = 11160 g

Mass percent of nitrogen = 10 %

This means that 10 grams of nitrogen is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of nitrogen present is 10 grams.

So, in 62000 grams of human body, the mass of nitrogen present will be =

Mass of nitrogen present = 6200 g

Mass percent of calcium = 3 %

This means that 3 grams of calcium is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of calcium present is 3 grams.

So, in 62000 grams of human body, the mass of calcium present will be =

Mass of calcium present = 1860 g

Mass percent of phosphorus = 1.6 %

This means that 1.6 grams of phosphorus is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of phosphorus present is 1.6 grams.

So, in 62000 grams of human body, the mass of phosphorus present will be =

Mass of phosphorus present = 992 g

Mass percent of other elements = 1.2 %

This means that 1.2 grams of other elements is present in 100 grams of human body.

By applying unitary method, we get:

In 100 g of human body, the mass of other elements present is 1.2 grams.

So, in 62000 grams of human body, the mass of other elements present will be =

Mass of other elements present = 744 g

Hence, the mass of oxygen is 40300 g, hydrogen is 11160 g, nitrogen is 6200 g, calcium is 1860 g, phosphorus is 992 g and other elements is 744 g in the body of 62 kg person.

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

although a subject of particular debate, many recent findings show that organic food is healthier than conventionally grown food. according to the usda, an extensive european union-funded study found that organically grown foods contain more beneficial compounds, such as the vitamins and antioxidants needed to combat many diseases (see references 5). organic milk, meat and eggs are regulated to ensure they are free of hormones administered to conventional livestock and poultry.

health implications of pesticides

pesticides affect human health in three ways: through skin contact, inhalation and ingestion. acute and long-term exposure to pesticides can cause serious health problems for farmers who apply them. the majority of other people are affected by drinking contaminated water and eating contaminated marine life (see references 3). pesticides have been linked to neurological disorders, endocrine and reproductive disorders, immune system deficiencies and cancer. according to the world health organization, acute pesticide poisoning (app) is responsible for significant annual mortality, especially in developing nations (see references 4).

other important considerations

not every small farm or business owner can afford the costly certification process required to be considered "certified organic," even if the farm is not using chemicals. "transitional" farms include those that once used chemicals and are now transitioning to organic-only production. in addition, though organic farming methods offer obvious environmental benefit, an organic apple shipped from around the world creates a different set of environmental problems. locally grown food (particularly locally grown, organic food) is key in sustainable food production.