According to le Châtelier’s principle if a system in equilibrium is subjected to a change in all BUT one of these conditions, there will be a tendency for a net reaction in the direction that reduces the effect of this change.

A) pressure
B) temperature
C) addition of a new reactant
D) number of moles of any component

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.