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1. calculate the number of moles in 3.75 x 10^23 formula units of MgCl2 2. calculate...

1. calculate the number of moles in 3.75 x 10^23 formula units of MgCl2

2. calculate the number of formula units in 92.06 grams of MgBr2

3. What is the percent composition of a compound that contains 9.21 grams nitrogen and 15.79 grams oxygen?

4. how many grams of oxygen are in a 75.5 gram sample of Al2O3?

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