Question

When ammonium nitrate, NH4NO3(s) is added to water at 25 °C, it dissolves spontaneously and the temperature of the solution decreases. This indicates that the factor causing the substance to dissolve is a change in:

a). Energy
b). Enthalpy
c). Entropy
d). temperature

My guess is Entropy, but I'm wavering on some of the other options too. Could someone help and clarify? Thanks!

Answer 1

When ammonium nitrate, NH4NO3(s) is added to water at 25 °C, it dissolves spontaneously and the temperature of the solution decreases. This indicates that the factor causing the substance to dissolve is a change in : delta H > 0,i.e.,enthalpy changes and delta S > 0,i.e.,entopy changes