What you mean be enthalpy ?

What,do you mean by enthalpy of a system? Write two characteristic of it.

What do you mean by enthalpy? Show that DeltaH= DeltaU + Delta nRT .

What do you mean by enthalpy of fusion? Explain it with example. What is its significance?

What do you mean by the enthalpy of solidification of water at 0^(@)C and 1 atm pressure =- 6.02 " kJ mol"^(-1) ?

a) What do you meant by enthalpy of vapourisation? b) Explain enthalpy of sublimation.