Be sure to answer all parts. Calculate the percent composition by mass (to 4 significant figures) of all the elements in calcium
phosphate (Ca3(PO4)2), a major component of bone.
% Ca
%P
% 0

38.7%

41.3%

20%

Explanation:

The percentage composition helps to know the what percent of the total mass of a compound is made up of each of the constituent elements or groups.

To solve this problem:

Compound:

 Ca₃(PO₄)₂

  Formula mass = 3(40) + 2[31 + 4(16)]

                           = 120 + 2(95)

                           = 120 + 190

                           = 310

%C = x 100  = 38.7%

%P = x 100  = 41.3%

%O = x 200  = 20%

the answer is 0.8m.

by: nicholas