The table below lists four physical processes carried out on one mole of the same pure substance at 1 atm.
(a) For each process, identify the algebraic sign of ΔH for the substance. Justify each sign in terms of the direction of heat flow between system and surroundings.
(b) Using typical relative magnitudes of molar enthalpies of phase change, rank the four processes from largest to smallest magnitude of ∣ΔH∣. Clearly explain the reasoning behind your ranking.