The formula has to be NH4F, NH4Cl, NH4I or NH4Br. NH4At is unstable. Those are the only halides of the ammonium ion. Which of them is 9.66% nitrogen?
Do the numbers. For NH4F, 14/37 = 37.8% is N. It is one of the others, with a much heavier halogen atom
An ammonium halide A contains 9.664% nitrogen. Identify A.
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