[Download the accompanying PDF worksheet.]

Perform the following calculations, being sure to give the answer with the correct number of significant digits.

1. How many atoms are in 8.21 g Li?
2. What is the mass in grams of 4.17×10²¹ formula units of magnesium perchlorate?
3. How many sulfur atoms are in 72 g of cobalt(III) sulfate?
4. How many grams of lithium are in 30.6 g of lithium nitride?
5. A sample of cadmium borate contains 72.9 g of boron.  What mass of cadmium will the sample contain?
6. What is the mass of sulfur in grams in a sample of manganese(VI) sulfate containing 8.291×10²⁴ oxygen atoms?

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