enthalpy 和 單位

The unit for enthalpy is "Joule". "J/mol" (or kJ/mol) is a unit for "specific enthalpy".

"Mole" is a well defined unit in physics. It is a unit for mass, similar to "kg" or "g". The other qunatities that you mentioned, car, bomb, banana, are not proper units that have a clear and specific definition in physics. The mass of a car, a bomb or a banna do vary from individual to individual, and hence completely not suitable to be adopted as a unit for mass.