Răspuns:
calculez masa de carbonat pur
p=m,px100/m,i------> m,p=600x80/100g= 480g
calculez moli carbonat ,stiind miu=124g/mol
niu=m/miu=480/124mol= 3,87molCuCO3
deduc moli gaz
1mol..............................1mol
CuC03---> CuO + CO2
3,87mol,,,,,,,,,,,,,,,,,,,,,,,,,,x
x= niu- 3,87mol
Explicație: