Calculate the Number of Moles of Cl Atoms

Calculation of Moles of Cl Atoms in Magnesium Chloride

Moles of Cl atoms can be calculated by first determining the molar mass of MgCl2. Magnesium (Mg) has a molar mass of approximately 24.31 g/mol and chlorine (Cl) has a molar mass of approximately 35.45 g/mol. Therefore, the molar mass of MgCl2 is 24.31 + (2 x 35.45) = 95.21 g/mol.

Next, we need to convert the given number of formula units of MgCl2 into moles. We are given 1.81×10^24 formula units. To do this, we need to multiply the given number of formula units by Avogadro's number, which is 6.022 x 10^23 formula units/mol. This gives us:

1.81 x 10^24 formula units x (1 mol / 6.022 x 10^23 formula units) = 3.007 mol

Now that we have the moles of MgCl2, we can determine the moles of Cl atoms. Since there are 2 Cl atoms in one formula unit of MgCl2, the number of Cl atom moles is:

3.007 mol x 2 = 6.01 mol

Therefore, there are 6.01 moles of Cl atoms in 1.81×10^24 formula units of magnesium chloride, MgCl2.