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

1. $\mathbf{\_Cu}\left(s\right)\mathbf{+}{\mathbf{\_S}}_{\mathbf{8}}\left(s\right)\mathbf{\to }{\mathbf{\_Cu}}_{\mathbf{2}}\mathbf{S}\left(s\right)$
2. ${\mathbf{\_P}}_{\mathbf{4}}{\mathbf{O}}_{\mathbf{10}}\left(s\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)\mathbf{\to }{\mathbf{\_H}}_{\mathbf{3}}{\mathbf{PO}}_{\mathbf{4}}\left(l\right)$
3. ${\mathbf{\_B}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{3}}\left(s\right)\mathbf{+}\mathbf{\_NaOH}\left(\mathrm{aq}\right)\mathbf{\to }{\mathbf{\_Na}}_{\mathbf{3}}{\mathbf{BO}}_{\mathbf{3}}\left(\mathrm{aq}\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)$
4. ${\mathbf{\_CH}}_{\mathbf{3}}{\mathbf{NH}}_{\mathbf{2}}\left(g\right)\mathbf{+}{\mathbf{\_O}}_{\mathbf{2}}\left(g\right)\mathbf{\to }{\mathbf{\_CO}}_{\mathbf{2}}\left(g\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(g\right)\mathbf{+}{\mathbf{\_N}}_{\mathbf{2}}\left(g\right)$
   

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