How much heat is relesed when 10 g of water is cooled from 80 C to 20 C​

Define dew point. i am writing this part to be able to ask the question

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size