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**1. Homework Statement**

CaCO3 <-> CaO + CO2

At 900K, equilibrium pressure of CO2 is 0.0423 atm. Calculate Gibbs Free energy of Reaction and K.

**2. Homework Equations**

delta G = -RTlnK

**3. The Attempt at a Solution**

delta G = 5656.3 cal/mol

K = 0.0423

I have a feeling that this is incorrect

Could someone confirm/clarify for me

Thanks