(1) Difference between specific enthalpy and enthalpy

Enthalpy of 1kg refrigerant (material) is called specific enthalpy.
The unit for specific enthalpy is "kJ/kg", and for enthalpy "kJ".
You can understand immediately when you recall the relationship between specific volume (m3/kg) and volume (m3).
Same as specific entropy.
Please be careful about that "specific" is sometimes removed as taken for granted.