How much heat is needed to freeze 30 moles of water?

Answer 1

first, when liquid water freezes, energy is released as heat. we don't need to supply energy as heat. so, it is wrong to ask how much heat is needed

delta H fusion for water = - 6.007 kJ / mol. that is, when 1 mol water freezes, 6.007 kJ is released. so, when 30 mol water freezes, 30 mol * 6.007 kJ / mol = 180 kJ is released