Which statement is true according to dalton’s theory?
a. atoms of different elements can join to form larger atoms.
b. atoms can be subdivided into smaller particles.
c. atoms of the same element differ in electric charge.
d. atoms of the same element are exactly alike

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.