August 2018 NY Regents Chemistry Exam
34 Which formula represents ammonium nitrate? (1) NH4NO3
(2) NH4NO2 (3) NH4(NO3)2
(4) NH4(NO2)2
Solution: ammonium nitrate is made up of two polyatomic ions. Table E lists polyatomic ions with their formulas and names. Ammonium is NH4+ and nitrate is NO3-. +1 and -1 cancel to give us a neutral molecule.
Answer: 1
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