1.
4K + O2 --> 2K2O
2Ca + O2 --> 2CaO
2Zn + O2 --> 2ZnO
2.
12,8g Ct g
2Cu + O2 --> 2CuO
2x64 2x80
=> Ct = 12,8x2x80/2x64 = 18 g CuO obtinut teoretic... dar practic cat s-ar fi obtinut.... la 8%...?
100% ................ 18g CuO (Ct)
80% .................... Cp = 14,4 g CuO obtinut practic