Question

What is the percentage composition of caso4? 29.44% ca, 23.55% s, 11.75% o 23.55% ca, 29.44% s, 11.75% o 29.44% ca, 23.55% s, 47.01% o 16.66% ca, 16.66% s, 66.66% o

Answer 1

Our formula for percent composition is:

Molar mass of element
----------------------------------- x 100
Molar mass of compound

So, lets find the molar mass of the compound as a whole before we begin. We do this by adding atomic masses from the periodic table.

Ca: 40.078
S: 32.065
O4: 63.996 (15.999 x 4)

To find our total mass, all we need to do is add those numbers together! Our molar mass of CaSO4 is 136.139 g/mol.

Now, lets use those individual masses and our total mass in the equation to find the percent composition of each element.

Ca: 40.078
---------- equals .294, and when we multiply that by 100 we get 29.44%
136.139

The percent composition of calcium in CaSO4 is 29.44%.

S: 32.065
------------- equals .235, and when we multiply that by 100 we get 23.55%
136.139

The percent composition of S in CaSO4 is 23.55%.

O4: 63.996
------------- equals .470, and when we multiply that by 100 we get 47.0%
136.139

The percent composition of O4 in CaSO4 is 47%.

Hope I could help!