Đáp án:

2. \(4FeS_2+11O_2\xrightarrow{t^{\circ}}2Fe_2O_3+8SO_2 \\ C_2H_6O+3O_2\xrightarrow{t^{\circ}}2CO_2+3H_2O\\ C_3H_4O_2+3O_2 \xrightarrow{t^{\circ}} 3CO_2+2H_2O\)

\(4C_3H_7N +19O_2 \xrightarrow{t^{\circ}} 12CO_2+14H_2O+2N_2\\ C_xH_y+\left(x+\frac y4\right)O_2\xrightarrow{t^{\circ}}xCO_2+\frac y2H_2O\\ C_xH_yO_z+\left(x+\dfrac y4-\dfrac z2\right)O_2 \xrightarrow{t^{\circ}}xCO_2+\dfrac y2H_2O\)

`C_xH_yO_zN_t+(x+y/4-z/2)O_2` $\xrightarrow{t^{\circ}}$ \(xCO_2+\dfrac y2H_2O+\dfrac t2N_2\) 

3. \(Zn+S\xrightarrow{t^{\circ}} ZnS\)

\(2Al+ 3S\xrightarrow{t^{\circ}} Al_2S_3\)

\(C+ 2S\xrightarrow{t^{\circ}} CS_2\)

\(S+O_2\xrightarrow{t^{\circ}} SO_2\)