Question

Дано:CaCO3W=(Ca)W=(C)W=(O)​

Answer 1

w(Ca)=m(елементу)/m(речовини)×100%

m(CaCO3)=40+12+48=100г/м

w(Ca)=40/100×100=40г/м або 40%

w(C)=12/100×100=12г/м або 12%

w(O3)=16×3/100×100=48г/м або 48%

Answer 2

Looks like you've provided a chemical formula: $CaCO_3$, where $W$ represents the subscripts for the respective elements. Let me break it down for you:

• $Ca$ represents calcium.
• $C$ represents carbon.
• $O$ represents oxygen.

So, $CaCO_3$ is the chemical formula for calcium carbonate. This is a common compound found in nature, such as in limestone, marble, and chalk. If you have a specific question about this compound or if you want more information, feel free to ask!