Table 2 Standard Gibbs free energies of formation used in this work are calculated via the gas reactions from48, valid for 1 bar pressure and the temperature (T) range 298–2500 K.

From: Mantle redox state drives outgassing chemistry and atmospheric composition of rocky planets

 

a

b

c

fG0 = a + bT log T + cT

2 C + \(\text {O}_{2}\) = 2 \(\text {CO}\)

− 214104.0

25.2183

− 262.1545

C + \(\text {O}_{2}\) = \(\text {CO}_{2}\)

− 392647.0

4.5855

− 16.9762

2 \(\text {H}_{2}\)+ \(\text {O}_{2}\)= 2 \(\text {H}_{2}\text {O}\)

− 483095.0

25.3687

21.9563

  1. Carbon is considered to exist in the form of graphite in our analysis.