How many moles of $Cl$ are in $1.2 * 10^24$ formula units of magnesium chloride?

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Answer 1 · 2017-09-04T16:42:01

$"4.0 mol"$ of $"Cl"^-$ ions.

Magnesium chloride is an ionic compound with an $"Mg"^(2+)$ ion and two $"Cl"^-$ ions in each formula unit. Thus:

$1.2*10^24 " formula units" * ("1 mol MgCl"_2)/(6.023*10^23 " formula units")*("2 mol Cl"^(-) " ions")/("1 mol MgCl"_2) = "2.0 mol Cl"^(-) " ions"$

How many moles of ClCl are in 1.2 * 10^241.2 * 10^24 formula units of magnesium chloride?