\(2Cu+O_2\rightarrow2CuO\)
\(n_{Cu.tham.gia}=a\left(mol\right)\)
\(12,8-64a+80a=14,8\)
\(\Rightarrow a=0,125\left(mol\right)\)
\(\Rightarrow n_{Cu.trong.X}=\frac{12,8-0,125.64}{64}=0,075\left(mol\right)\)
\(Cu+2H_2SO_4\rightarrow CuSO_4+SO_2+H_2O\)
\(\Rightarrow n_{SO2}=n_{Cu}=0,075\left(mol\right)\)
\(\Rightarrow V_{SO2}=0,075.22,4=1,68\left(l\right)\)
\(2Cu+O2-->2CuO\)
\(n_{Cu}=\frac{12,8}{64}=0,2\left(mol\right)\)
\(m_{O2}=14,8-12,8=2\left(g\right)\)
\(n_{O2}=\frac{2}{32}=0,0625\left(mol\right)\)
\(n_{Cu}=2n_{O2}=0,125\left(mol\right)\)
\(n_{Cu}dư=0,2-0,125=0,075\left(mol\right)\)
Vậy chất rắn sau pư là CuO và Cu dư
\(Cu+2H2SO4-->CuSO4+2H2O+SO2\)
0,075-------------------------------------------------->0,075(mol)
\(V_{SO2}=0,075.22,4=1,68\left(l\right)\)