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# CHEMISTRY HELP ?

How many formula units are equal to 2.75 moles aluminum chloride?

A 16.6 formula units

B) 2.19 formula units

C) 1.66 x 10²⁴ formula units

D) 2.19 x 10²³ formula units

### 2 Answers

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- lenpol7Lv 71 month ago
Remember the Avogadro Number.

1 mole(formula units) = 6.022 x 10^23 molecules.

Hence for 2.75 moles there are 6.022 x 19^23 = 1.66 x 10^24 formula units(molecules).

- az_lenderLv 71 month ago
Think of "formula units" as almost a synonym for "molecules." It's just that the solid may be in a lattice where you can't associate a particular chlorine with any one of the surrounding aluminum atoms.

Answer: 2.75 x 6.02 x 10^23 = 1.66 x 10^24 formula units

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