The diagram below shows a Bunsen burner heating a beaker of water on a braker stand the arrows represent the transfer of heat energy in the water which process is primarily responsible for the transfer of heat indicated by the arrows in the beaker of water

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.