Question

Which quantity is exothermic? A Enthalpy change of atomisation of sulfur. B First ionisation energy of sulfur. C First electron affinity of sulfur. OD Second electron affinity of sulfur.

Answer 1

Ответ:

С по-моему правильно!

Answer 2

In general, exothermic processes release energy, while endothermic processes absorb energy. Let's analyze the given quantities:

A. Enthalpy change of atomization of sulfur: This is the energy required to break one mole of sulfur molecules into individual sulfur atoms. Breaking chemical bonds requires energy, so this process is endothermic, not exothermic.

B. First ionization energy of sulfur: This is the energy required to remove one mole of electrons from one mole of sulfur atoms to form one mole of singly charged sulfur ions. Removing electrons from an atom generally requires energy, so this process is also endothermic, not exothermic.

C. First electron affinity of sulfur: This is the energy released when one mole of electrons is added to one mole of sulfur atoms to form one mole of singly charged sulfur ions. This process releases energy, making it exothermic.

D. Second electron affinity of sulfur: Adding a second electron to a singly charged ion is generally an endothermic process because it involves adding an electron to an already negatively charged ion. So, this process is not exothermic.

Therefore, the exothermic process among the options you provided is C. First electron affinity of sulfur.