Module 3.3 Percent Composition

Question 1

What is the Percentage Composition of

Ca₃(PO₄)₂

Answer 1

MW = 310.18 (previous module)

%Ca = 3*40.08 / 310.18 * 100 = 38.76
%P = 2*30.97 / 310.18 * 100 = 19.97
%O = 8*16 / 310.18 * 100 = 41.27

Question 2

What is the Percentage Composition of

C₃H₂O₂Cl

Answer 2

MW = 108.52 (previous module)
3 C * 12.01= 36.03
5 H * 1.008 = 5.04
2 O * 16 = 32
1 Cl * 35.45 = 35.45

%C = 36.03 / 108.52 * 100 = 33.20
% H = 5.04 / 108.52 * 100 = 4.64
%O = 32 / 108.52 * 100 = 29.49
%Cl = 35.45 / 108.52 * 100 = 32.67