According to Democritus, what is the composition of matter?

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.