Which is the most common type of precipitation?
a)hail
b)rain
c)sleet
d)snow ​

The most common type of precipitation is B. Rain.

Explanation: It would have to be constantly cold to have A. C. or D. as the answers.

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.