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An oxide of nitrogen is found to contain nitrogen and oxygen combined together in the ratio of 7:16 by mass. Derive the formula of the oxide and name it?
Ratio of N : O by mass  = 7 : 16
Formula of the  N : O of the given combination  = Mass / Atomic mass   = 7/7 : 16/8 = 1: 2
                      =  NO2