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)

For Oxygen:

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

For Hydrogen:

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

For Nitrogen:

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

For Calcium:

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

For Phosphorus:

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

For other elements:

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.

Answer(true);

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -