Final answer:
In one mole of magnesium iodide (MgI2), there is one mole of magnesium ions (Mg2+), hence the correct answer is A. 1 mole.
The correct option is A.
Step-by-step explanation:
The question you're asking relates to the stoichiometry of the compound magnesium iodide (MgI2). In one formula unit of magnesium iodide, there is one magnesium ion (Mg2+).
This means that in one mole of MgI2, there is one mole of Mg2+ ions. Therefore, the correct answer to how many moles of Mg ions are in MgI2 is A. 1 mole.
The correct option is A.