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

1. ${\mathbf{\_SO}}_{\mathbf{2}}\left(g\right)\mathbf{+}{\mathbf{\_O}}_{\mathbf{2}}\left(g\right)\mathbf{\to }{\mathbf{\_SO}}_{\mathbf{3}}\left(g\right)$
   
2. ${\mathbf{\_Sc}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{3}}\left(s\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)\mathbf{\to }\mathbf{\_Sc}{\left(\mathrm{OH}\right)}_{\mathbf{3}}\left(s\right)$
   
3. ${\mathbf{\_H}}_{\mathbf{3}}{\mathbf{PO}}_{\mathbf{4}}\left(\mathrm{aq}\right)\mathbf{+}\mathbf{\_NaOH}\left(\mathrm{aq}\right)\mathbf{\to }{\mathbf{\_Na}}_{\mathbf{2}}{\mathbf{HPO}}_{\mathbf{4}}\left(\mathrm{aq}\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(l\right)$
   
4. ${\mathbf{\_C}}_{\mathbf{6}}{\mathbf{H}}_{\mathbf{10}}{\mathbf{O}}_{\mathbf{2}}\left(s\right)\mathbf{+}{\mathbf{\_O}}_{\mathbf{2}}\left(g\right)\mathbf{\to }{\mathbf{\_CO}}_{\mathbf{2}}\left(g\right)\mathbf{+}{\mathbf{\_H}}_{\mathbf{2}}\mathbf{O}\left(g\right)$
   

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