Yes, but first, note the correct spelling of celsius.
By definition, delta H (enthalpy) is - if heat is emitted from a reaction and + if heat is absorbed by a reaction. Since the temperature of the water decreases that means the solvation of NH4NO3 absorbed energy and it told you that by taking the heat (enthalpy) from the water.
NH4NO3 + H2O ==> NH4NO3(solution)- heat which can be re-written as
NH4NO3 + H2O + heat = NH4NO3(aq)
and delta H is + for an endothermic reaction (again, by definition).
When solid NH4NO3 is dissolved in water at 25celcius, the temp of the solution decreases. What is true about the signs of enthalpy and entropy for this process?
I understand entropy is positive, however, i do no understand why enthalpy is also positive. Can someone please explain this to me, possibly a simple example with a chemical in everyday life?
3 answers
What is your profession Dr Bob
I'm a retired chemistry professor from a university in Louisiana (but not living in Louisiana now). Taught chemistry for 40 years.