Question

Write balanced equations for each of the following by inserting the correct coefficients in the blanks:

1. ${\mathbf{\_As}}_{\mathbf{4}}{\mathbf{S}}_{\mathbf{6}}\left(s\right)\mathbf{+}{\mathbf{\_O}}_{\mathbf{2}}\left(g\right)\mathbf{\to }{\mathbf{\_As}}_{\mathbf{4}}{\mathbf{O}}_{\mathbf{2}}\left(s\right)\mathbf{+}{\mathbf{\_SO}}_{\mathbf{2}}\left(g\right)$
   
2. ${\mathbf{\_Ca}}_{\mathbf{3}}{\left({\mathrm{PO}}_4\right)}_{\mathbf{2}}\left(s\right)\mathbf{+}{\mathbf{\_SiO}}_{\mathbf{2}}\left(s\right)\mathbf{+}\mathbf{\_C}\left(s\right)\mathbf{\to }{\mathbf{\_P}}_{\mathbf{4}}\left(g\right)\mathbf{+}{\mathbf{\_CaSiO}}_{\mathbf{3}}\left(l\right)\mathbf{+}\mathbf{\_CO}\left(g\right)$
3. $\mathbf{\_Fe}\left(s\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(g\right)\mathbf{\to }{\mathbf{\_Fe}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{3}}\left(s\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\left(g\right)$
   
4. ${\mathbf{\_S}}_{\mathbf{2}}{\mathbf{Cl}}_{\mathbf{2}}\left(l\right)\mathbf{+}{\mathbf{\_NH}}_{\mathbf{3}}\left(g\right)\mathbf{\to }{\mathbf{\_S}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{4}}\left(s\right)\mathbf{+}{\mathbf{\_S}}_{\mathbf{8}}\left(s\right)\mathbf{+}{\mathbf{\_NH}}_{\mathbf{4}}\mathbf{Cl}\left(s\right)$
   

Short answer

1. ${\mathrm{As}}_4{\mathrm{S}}_6\left(\mathrm{s}\right)+4{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{As}}_4{\mathrm{O}}_2\left(\mathrm{s}\right)+6{\mathrm{SO}}_2\left(\mathrm{g}\right)$
   
2. $2{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2\left(\mathrm{s}\right)+2{\mathrm{SiO}}_2\left(\mathrm{s}\right)+6\mathrm{C}\left(\mathrm{s}\right)\to {\mathrm{P}}_4\left(\mathrm{g}\right)+2{\mathrm{CaSiO}}_3\left(\mathrm{l}\right)+6\mathrm{CO}\left(\mathrm{g}\right)$
   
3. $3\mathrm{Fe}\left(\mathrm{s}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+4{\mathrm{H}}_2\left(\mathrm{g}\right)$
   
4. $6{\mathrm{S}}_2{\mathrm{Cl}}_2\left(\mathrm{l}\right)+16{\mathrm{NH}}_3\left(\mathrm{g}\right)\to {\mathrm{S}}_4{\mathrm{N}}_4\left(\mathrm{s}\right)+{\mathrm{S}}_8\left(\mathrm{s}\right)+12{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)$
   

Step-by-step solution

Step1. Considering the following chemical equations:

Balancing all atoms other than H and O, after that balanced O and H Then checked overall equation is balanced or not.

For balancing the equation we chose firstly the most complicated looking molecule in the equation. For exampleS₄N₄.

Step2. The final balanced reaction:

1. ${\mathrm{As}}_4{\mathrm{S}}_6\left(\mathrm{s}\right)+4{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{As}}_4{\mathrm{O}}_6\left(\mathrm{s}\right)+6{\mathrm{SO}}_2\left(\mathrm{g}\right)$
   
2. $2{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2\left(\mathrm{s}\right)+2{\mathrm{SiO}}_2\left(\mathrm{s}\right)+6\mathrm{C}\left(\mathrm{s}\right)\to {\mathrm{P}}_4\left(\mathrm{g}\right)+2{\mathrm{CaSiO}}_3\left(\mathrm{l}\right)+6\mathrm{CO}\left(\mathrm{g}\right)$
   
3. $3\mathrm{Fe}\left(\mathrm{s}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{Fe}}_3{\mathrm{O}}_4\left(\mathrm{s}\right)+4{\mathrm{H}}_2\left(\mathrm{g}\right)$
   
4. $6{\mathrm{S}}_2{\mathrm{Cl}}_2\left(\mathrm{l}\right)+16{\mathrm{NH}}_3\left(\mathrm{g}\right)\to {\mathrm{S}}_4{\mathrm{N}}_4\left(\mathrm{s}\right)+{\mathrm{S}}_8\left(\mathrm{s}\right)+12{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)$