Fe2O3(s) + 3 CO(g) ⇌2 Fe(l) + 3 CO2(g)
According to Le Chatelier's principle change in concentration by changing the amount of reactant or product affect the equilibrium. However, the addition of solid reactant won't affect the concentration. Therefore, addition of solid Fe2O3 will not disturb the equilibrium. Same for Fe(l). Adding CO disturbs the equilibrium to the right, CO2 - to the left. Removing CO - left, removing CO2 - right.
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Thank you very much. It was really helpful. I will like to know what effect i)removing CO ii) removing CO2 iii) Adding Fe2O3 has on the reaction quotient, Qc, (i.e. does it increase or decrease or remains unchanged), please? Thanks!