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How many atoms of chlorine are in 19.0 grams of MgCl2?

24.3 + 2(35.5) = 95.3

19.0/95.3 x 6.022 x 1023 = 1.201 1023

2 answers

1.20 x 10^23 formula units x 2 Cl atoms / formula unit = 2.40 x 10^23 Cl atoms.

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