nFe=0,05; nCu=0,02
Theo bảo toàn e:
Fe\(\rightarrow\)Fe+3+3e_________N+5 +1e\(\rightarrow\)N+4
Cu\(\rightarrow\)Cu+2 +2e
\(\rightarrow\)3nFe+2nCu=nNO
\(\rightarrow\)nNO=3.0,05+2.0,02=0,19
\(\rightarrow\)VNO2=4,256l
Cu | + | 4HNO3 | → | Cu(NO3)2 | + | 2H2O | + | 2NO2 |
Fe | + | 6HNO3 | → | 3H2O | + | 3NO2 | + | Fe(NO3)3 |
Tacos
n Fe=2,8/56=0,05(mol)
nCu=1,28/64=0,02(mol)
Theo pthh1
n NO2=2n Cu=0,04(mol)
Theo pthh2
n NO2=3n Fe=0,15(mol)
V NO2=(0,04+0,15).22,4=4,256(l)