[dudebuddyguy]

There are usually tables with standard Gibbs energies. Alternatively, since these are oxidation/reduction reactions, you can use standard oxidation and reduction potentials, which are widely available.  Using the Nernst equation you can easily convert these to Gibbs energies.

....What? I have no clue what a Nernst equation is.

[Corribus]

It sounds like you just need to start reading a general chemistry book.  There is really only so much we can do to help until you have a solid foundation to work with.

[dudebuddyguy]

Update: I just checked off every single reaction as non-spontaneous and wrote a quick note for the teacher who does the marking, letting her know that I've never done this type of math before.

So yeah....

/thread