Question

calculate the mass percentage of calcium carbonate

Answer 1

I hope this is help you

Answer 2

You take the atomic mass of calcium over the atomic mass of
C
a
C
O
3
and multiply it by 100 to get the percentage.
The mass of
C
a
is 40.078 g; the mass of
C
is 12.01 g, and the mass of
3
O

is 47.997 g (
15.999 g
×
3
).
Add all the masses together to get a total mass of 100.085 g.
So,
40.078 g
100.085 g
=
0.4004 or 40.04 %