Please Guys I'm so desparate. I don't understand any of this. if you can show me a clear, step by step, exlanation using these examples that would be very helpful.

Please tell me what tables you loook at to find any constants along the way.

thanks guys.

the equations i'm aware of are...

G= -nFE
G= H - tS

i have no idea where to begin. this is supposed to be EASY.

1. 1. Calculation of DG°´ for the reaction: H2 + ½ O2 ® H2O. Is the reaction spontaneous?
2. A zinc copper battery has a voltage of 1.10 V. How much is the Gibb's energy for the redox reaction: Zn + Cu2+ ? Zn2+ + Cu
Given that Faraday's constant = 23,063 cal/V

3. A xylanase enzyme has KM and Vmax of 10 mM and 50 mM.s-1, respectively. Calculate the reaction velocity at the substrate concentration of 2.5 mM.
4. What relation exists between Km and S when an enzyme-catalyzed reaction proceeds at a) 75% Vmax and b) 90% Vmax.
5. Determine the change in the Gibb's free energy for the following reaction. Is the reaction spontaneous?
16 H2S(g) + 8 SO2(g) ---> 16 H2O(l) + 3 S8(s)