When two objects are at the same temperature and no heat flows, this is called:

thermal equilibrium

Explanation:

When they are at the same temperature, we say that they are in thermal equilibrium , and there is no overall transfer of energy any more between the two objects.

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.