Calculate the number of moles of Cl atoms in 1.81×10^24 formula units of magnesium chloride,MgCl2.

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

1.81×10^24 formula units MgCl2 ( 1 mol / 6.022x10^23 formula units ) ( 2 mol Cl / 1 mol MgCl2 ) = 6.01 mol Cl atoms

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RomeliaThurston RomeliaThurston · Answer 2 · 2019-09-18T06:26:36+02:00

Answer: The number of moles of Chlorine atoms in given formula units of magnesium chloride are 6 moles.

Explanation:

Formula unit is defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is [tex]6.022\times 10^{23}[/tex]

We are given:

Number of formula units of magnesium chloride = [tex]1.81\times 10^{24}[/tex]

By applying unitary method, we get:

If [tex]6.022\times 10^{23}[/tex] number of formula units are present in 1 mole of a compound.

So, [tex]1.81\times 10^{24}[/tex] number of formula units will be present in [tex]\frac{1}{6.022\times 10^{23}}\times 7.81\times 10^{24}=3mol[/tex] of magnesium chloride.

For the given compound magnesium chloride:

As, 1 mole of magnesium chloride contains 1 mole of magnesium atom and 2 atoms of chlorine atoms.

So, 3 moles of magnesium chloride will contain [tex](1\times 3)=3mol[/tex] of magnesium atoms and [tex](2\times 3)=6mol[/tex] of chlorine atoms.

Hence, the number of moles of Chlorine atoms in given formula units of magnesium chloride are 6 moles.