A typical cold pack involves mixing a solid salt, such as ammonium nitrate, with water. In other words, the cold pack you might buy at a pharmacy to put on a sprained ankle is just a dissolution chemical reaction. This reaction must be:: a. Exothermic and spontaneous
b. Endothermic and spontaneous
с. Endothermic requiring work
d. Exothermic requiring work
e. Not enough information

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

the awnser is group 12