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At $800^oC$, there is the equilibrium:
$CaCO_3(s)$ 
$CaO(s)$ $+$ $CO_2(g)$,
with:
$K_p$ $=$ $0.220\; atm$
We calculate $[CO_2]$ :
$K_p = $
..........
Relation between $K_p$ and $K$:
..........
from where we get $[CO_2]$:
..........
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