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The species is; Ca(NO3)2 ( NO3(-) is a polyatomic ion and is in parenthesis )

7.5 grams Ca(NO3)2 (1 mole Ca(NO3)2/164.1 grams)(2 mole N/1 mole Ca(NO3)2)(6.022 X 10^23/1 mole N)

= 5.5 X 10^22 atoms of nitrogen

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