Heat + H2O(l) <---> H2O(g) which T=373K, P= 101kPa?

which of the following will favour the reverse reaction...

the total volume of the system is increased

boiling water is added to the system

water vapour is removed from the system

the system is cooled

Answer:
Only the fourth will have any backwards effect on the equilibrium.
Well, when the system is cooled because of decrease in entropy of the system ( from gas to liquid ) or you can think it in terms of Le- Chatelier's Principle.

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