How Many Moles Of Molecules Or Formula Units Are In Each Sample

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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