Assertion: nitrogen dioxide's gas | /r/HasProperty | n 2
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Source sentences:
text: Nitrogen forms nine molecular oxides, some of which were the first gases to be identified: N 2 O (nitrous oxide), NO (nitric oxide), N 2 O 3 (dinitrogen trioxide), NO 2 (nitrogen dioxide), N 2 O 4 (dinitrogen tetroxide), N 2 O 5 (dinitrogen pentoxide), N 4 O (nitrosylazide), and N(NO 2 ) 3 (trinitramide).