\(2N_xO_y+2yCu\rightarrow2yCuO+xN_2\)
\(Fe_xO_y+yH_2\rightarrow xFe+yH_2O\)
\(C_xH_yO_z+\left(x+\frac{y}{4}-\frac{z}{2}\right)O_2\rightarrow xCO_2+\frac{y}{2}H_2O\)
a) 2NxOy + 2yCu ----- 2yCuO + xN2
b) FexOy + yH2 ------- xFe + yH2O
c) CxHyOz +(x+\(\frac{y}{4}-\frac{z}{2}\)) O2 ------- xCo2 + \(\frac{y}{2}\)H2O