explain the correspondence between the position of an element in the periodic table and its capacity of combination (valence), among others the alkali metals, the alkaline earth metals, the chalcogens, the halogens, the rare gases

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.

gas

explanation:

smoke is the matter of a gas

the answer your looking for is c).