Select the correct answer. What is the purpose of the arrow in a chemical equation?
OA. It indicates the direction in which the reaction occurs.
OB. It separates the elements from the compounds.
O c. It indicates the direction of increase in the number of molecules.
OD. It indicates the direction of heat movement in a reaction.

OD. it indicates the direction of the

i do not get it   at all

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.