Howe would you calculate the number of moles of Cl atoms in 3.61x10^24 formula units of magnesium chloride, MgCl_2?

2 Answers
SCooke
Mar 26, 2017

Use Avogadro’s number to calculate the number of moles of MgCl_2. The number of moles of Cl is twice as much, because the ratio of Cl in MgCl_2 to MgCl_2 is 2:1.

(3.61*10^24)/(6.022*10^23) = 5.99
Therefore, there are 12 moles of Cl.

Meave60
Mar 26, 2017

There are 7.22xx10^24 atoms "Cl" in 3.61xx10^24 formula units of "MgCl"_2".

Explanation:

Each formula unit of magnesium chloride, "MgCl"_2", contains two chlorine, "Cl", atoms.

Multiply the number of formula units by the conversion factor

(2color(white)(.)"atoms Cl")/(1color(white)(.)"formula unit MgCl"_2.

3.61xx10^24color(red)cancel(color(black)("formula units MgCl"_2))xx(2color(white)(.)"atoms Cl")/(1color(red)cancel(color(black)("formula units MgCl"_2)))=7.22xx10^24"Cl atoms"

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