what are the three how much heat must be added to 240g of aluminium to change it from a solid at 27 to a liquid at 660 given the specific heat capacity of aluminium is 880 and heat of fusion is 397

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

It really doesn't matter for any of the questions that you've listed.

If your workout exceeds an hour you should substitute "a sports drink" for water.hope my answer has you : )