# Calculate the Number of Moles of Cl Atoms in Magnesium Chloride

## Calculation:

**Given:** Number of formula units of magnesium chloride = 1.81Ã10^24

We can use Avogadro's number to convert the number of atoms or molecules into moles.

1.81Ã10^24 formula units MgCl2 * (1 mol / 6.022x10^23 formula units) * (2 mol Cl / 1 mol MgCl2) = 6.01 mol Cl atoms

## Answer:

The number of moles of Chlorine atoms in 1.81Ã10^24 formula units of magnesium chloride is 6 moles.

## Explanation:

A formula unit is the lowest whole number ratio of ions in an ionic compound.

By multiplying the number of moles by Avogadro's number (6.022Ã10^23), we can calculate the number of formula units.

1 mole of magnesium chloride contains 1 mole of magnesium atoms and 2 moles of chlorine atoms.

Therefore, in 1.81Ã10^24 formula units of magnesium chloride, there are 6 moles of chlorine atoms.