Desertification

a. will typically increase the amount of erosion in an area
b. does not have any effect on the level of vegetation
c. decreases the amount of salt in the soil
d. increases the ability of the land to support life

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.