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## Homework Statement

CaCO3 <-> CaO + CO2

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

## Homework Equations

delta G = -RTlnK

## 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