How are piaget and erikson's theories similar?

both study the emotional development of children.
both relied on freud's foundational work.
both are stage theorists.
all of the above

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.