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. ${\mathbf{\_S}}_{\mathbf{2}}{\mathbf{Cl}}_{\mathbf{2}}\left(l\right)\mathbf{+}{\mathbf{\_NH}}_{\mathbf{3}}\left(g\right)\mathbf{\to }{\mathbf{\_S}}_{\mathbf{4}}{\mathbf{N}}_{\mathbf{4}}\left(s\right)\mathbf{+}{\mathbf{\_S}}_{\mathbf{8}}\left(s\right)\mathbf{+}{\mathbf{\_NH}}_{\mathbf{4}}\mathbf{Cl}\left(s\right)$
   

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