How many moles (of molecules or formula units) are in each sample?  28.1 kg Fe (

How many moles (of molecules or formula units) are in each sample? 
28.1 kg Fe (NO3) 2Express your answer to three significant figures and include the appropriate units.0.5698 g C8H18Express your answer to four significant figures and include the appropriate units.131 kg CaOExpress your answer to three significant figures and include the appropriate units.

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