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What is the equilibrium constant for the reaction: Si + O2 <-> SiO2 ?

Is the answer just [SiO2]/[Si][O2] ?

1 answer

If that is an all gaseous reaction the expression you wrote is correct However, if Si and SiO2 are solids, then Kc =
1/(O2) since the solids are not included in the Kc.
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