“cu” is a pair of letters the element we call “copper”.
the letter pair “cu” is not the name of an element; it’s a chemists use to represent it
a. chemical formula
b. name
c. symbol

what does the table look like

2b2t

explanation:

2b2t

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.