HELPPP
1. If 4,500 joules of heat are emitted when a sample of water freezes, what is the mass of the water? And is it endothermic or exothermic
2. Calculate the number of grams of ice, at 0.0 ºC, that could melt if 3.6 kJ of heat were added. And is it endothermic or exothermic
3. Find the number of grams of vapor that condense into 373 K when 17.2 kJ of heat is removed. And is it endothermic or exothermic