What is the change of state described in the experiment to determine the molar heat of fusion of ice? 1) 1 mol H₂O (s) + molar heat of fusion → 1 mol H₂O (l) 2) 1 mol H₂O (l) + molar heat of fusion → 1 mol H₂O (s) 3) 1 mol H₂O (s) + molar heat of vaporization → 1 mol H₂O (l) 4) 1 mol H₂O (l) + molar heat of vaporization → 1 mol H₂O (s)
