If you know the atomic number and the mass number of an atom of any element, you can determine the atom's composition. A:True
B:False​

True. i hope its correct, have a good day. stay happy and stay safe

A:true

Explanation:

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules.

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.