Question

7. Calculate the percent compositions for each element in:

a. calcium fluoride, CaF₂
b. magnesium nitride, Mg N
c. cadmium perchlorate, Cd(CIO4)2

Answer 1

Answer:
CaF2 : 78.07%
MgN: 28%
Cd(ClO4)2: 128.48 %

To do percent composition you take the molar mass of each element and add those up to find the percent. you would just do something like this :

Example: calculate the percent composition of CdI

Cd: 1x112.41 = 112.41
I: 2x126.90 = 253.80
Total for 112.41+253.80 = 366.21
mass percent: 112.41/366.21 x 100 = 30.70 % 253.80/366.21 = 69.30 %
30.70% + 69.30 % = 100%

hope these help!