Formation of water from its elements is spontaneous, but is slow. Comment .

Explanation

Free energy decreases during the formation of water from its elements. Hence thermodynamically the reaction is spontaneous . Criterion of spontanity should not be correlated with time . Spontaneous reaction means that it will take place but how long it will take , thermodynamics does not tell.
At room temperature , without using catalyst , about 1% of the reaction is complete is one year.
The reaction is slow . It is kinetically non - spontaneous.