Answer
See explanation
Work Step by Step
1 mole mass of oxygen = 16 g
1 mole mass of nitrogen = 14 g
The ratio of the mass of O to the mass of N in N2O3 = 12:7
Formula of compound with the O:N mass ratio 16:7 = NO2
In NO2, Mass ratio of N=7 and Mass ratio of O = 16.
Formula of the compound with the O:N mass ratio 16:14 (or 8:7) (next in the series) = NO