680 kg of fish at 5c are to be frozen and stored at -12c. the specific heat of fish above freezing point is 3.182, and below freezing point is 1.717 kj/kgk. the freezing point is -2c, and the latent heat of fusion is 234.5 kj/kg. how much heat must be removed to cool the fish , and what per cent of this is latent heat?