If we add a catalyst to the following equation, CO + H2O + heat CO2 + H2, which way will the equilibrium shift?

No effect.

Explanation:

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In this case, considering the widely studied Le Chatelier's principle, we can realize that the factors affecting equilibrium are concentration, temperature and pressure and volume if the reaction is in gaseous phase and with non-zero change in the number of moles. In such a way, by adding a catalyst to given reaction will have no effect on the equilibrium direction.

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