Enthalpy of atomization for iodine

Steps:

• Define enthalpy of atomization as the enthalpy change to form gaseous atoms from the element in its standard state.
• Identify iodine's standard state as solid I₂(s).
• Require the equation to produce 1 mole of gaseous atoms from half a mole of solid diatomic molecules.
• Compare options to find the match: ½I₂(s) → I(g).

Why C is correct:

• It matches the definition, converting solid iodine to 1 mole of gaseous atoms per half mole of I₂(s).

Why the others are wrong:

• A starts from gas, not standard solid state.
• B reverses the atomization process (negative enthalpy).
• D uses full I₂(g) to 2I(g), not from solid and not per mole of atoms.

Final answer: C