Consider the decomposition of a metal oxide to its elements, where M represents a generic metal.

M203(s)<---> 2M(s) + 1/2 O2(g)

info given for Gf(kJ/mol):
M203= -6.00
M(s)=0
O2(g)= 0

1.) what is the standard change in Gibbs energy for rxn as written in forward direction? (kJ/mol)

2.) What is the equilibrium constant (K) of this rxn, as written in forward direction at 298K?

3.) What is the equilibrium pressure of O2(g) over M(s) at 298K? (atm)

1 answer

What are the units? -6.00 what?

1.
dHrxn = (n*Gf products)-(n*dGf reactants).

2.
dG = -RTlnK

3.
Kp = pO2