Answer:
The mass percent of copper as element is the same.
Explanation:
First of all we need the reaction that is presented below:
[tex]CuCO_{3 (s)} +Heat[/tex] → [tex]CuO_{(s)} + CO_{2 (g)}[/tex]
The mass percent of copper (Cu) as element is the same because of during the reaction the element only transform its nature from copper carbonate ([tex]CuCO_{3 (s)}[/tex]) to copper oxide ([tex]CuO_{(s)}[/tex]), the latter is a solid and will remain in the system.
On the other hand, you will note that the global percentage mass will be small because of the reaction produce ([tex]CO_{2 (g)}[/tex]) that is a gas and this one will escape for the system.
Have a great day!
