I need to find the ΔG° for the following equations:

1. Hg2+(aq) + H2(g) 2 H1+(aq) + Hg (l)

2. Sn2+(aq) + 2 Fe3+(aq) Sn4+(aq) + 2 Fe2+(aq)

3. 5 Cu2+(aq) + 2 Mn2+(aq) + 8 H2O(l) 5 Cu(s) + 2 MnO41-(aq) + 16 H1+(aq)

4. Cr2O72-(aq) + 14 H1+(aq) + 6 Fe2+(aq) 2 Cr3+(aq) + 6 Fe3+(aq) + 7 H2O(l)