Product of K2S + H2O and balance it.  

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K2S is potassium sulfide.  It acts as a base and it readily reacts with water (even water vapor in the present in the air).  The balanced chemical equation is below.

K2S + H2O --> KSH + KOH

The reaction produces potassium hydrogen sulfide and potassium hydroxide.  The balanced equation involves one molecule for each species.

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