Directions: The solubility curve for several common salts is shown in the graph. Use the graph to answer any questions that follow.

A KNO3 solution hits saturation when 75 g of salt have dissolved. At which temperature is the solution?

A.
15°C

B.
25°C

C.
45°C

D.
55°C

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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.