Which equation represents the process that occurs when the standard enthalpy of atomisation of iodine is measured? A $\frac{1}{2} I_2 (s) \rightarrow I(g)$ B $I_2 (s) \rightarrow 2 I(g)$ C $\frac{1}{2} I_2 (g) \rightarrow I(g)$ D $I(g) \rightarrow 2 I(g)$ - AQA - A-Level Chemistry - Question 14 - 2018 - Paper 3

The standard enthalpy of atomisation refers to the process of converting a substance in its standard state into gaseous atoms. For iodine, the correct equation that represents this process is:

Answer: $I_2 (s) \rightarrow 2 I(g)$

This indicates that one mole of solid iodine ( $I_2 (s)$) is converted into two moles of gaseous iodine atoms (2$I(g)$).