Question

Give an example of a spontaneous process which is endothermic.

Answer 1

Dissolving Salt in Water

If you pour table salt into a container of water, the salt dissolves on its own; the reaction consumes some energy from the water, lowering its temperature slightly. Even though enthalpy increases, entropy increases even more. The reaction is both endothermic and spontaneous at standard temperature and pressure.

Cold Packs

Chemical cold packs consist of two pouches, one containing water, the other containing ammonium nitrate or a similar substance. A thin membrane separates the pouches. When this membrane is broken, the ammonium nitrate dissolves in water, turning the mixture cold. The reaction is spontaneous because its Gibbs free energy is lower after the reaction than before; the entropy at the end of the process is greater than the enthalpy. The reaction takes heat from the water, so it is endothermic.

Answer 2

Answer:

example of spontaneous confusion is