Helium is the lightest monatomic element is this a chemical property

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c