Capillaries are the smallest and most fragile of the body's blood vessels. They are responsible for what is known as microcirculation, meaning that they create a circulatory network within the organs of the body. There are three different types found in the human body: continuous, fenestrated, and sinusoidal.
1 Find the empirical formula. 2  Get the mass of each element by assuming a certain overall mass for the sample (100 g is a good mass to assume when working with percentages). 3  Convert the mass of each element to moles.  Find the ratio of the moles of each element.
Step 4: Find the mass percent composition of each element. To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.Mass percent composition of K = mass contribution of K/molecular mass of K 3 Fe(CN) 6 x 100%.ach element's contribution is expressed as a percentage of the whole. This step by step tutorial will show the method to determine the mass percent composition of a molecule. Example: Calculate the mass percent composition of each element in a potassium ferricyanide, K 3 Fe(CN) 6 molecule.