Answer is: c. N2O, N2O4, N2O5.
Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.
1) NO; m(N) : m(O) = 14 : 16 = 7 : 8.
2) N₂O; m(N) : m(O) = 2·14 : 16 = 7 : 4.
3) NO₂; m(N) : m(O) = 14 : 2·16 = 7 : 16.
4) N₂O₅; m(N) : m(O) = (2·14) : (5·16) = 7 : 20.
5) NO₄; m(N) : m(O) = 14 : (4·16) = 7 : 32.
6) N₂O₄; m(N) : m(O) = (2·14) : (4·16) = 7 : 16.
A) m(N) : m(O) = 5.6 g : 3.2 g /÷3.2
m(N) : m(O) = 1.75 : 1 /×4.
m(N) : m(O) = 7 : 4.
B) m(N) : m(O) = 3.5 g : 8.0 g /÷3.5
m(N) : m(O) = 1 : 2.285/ ×7.
m(N) : m(O) = 7 : 16.
C) m(N) : m(O) = 1.4 g : 4.0 g / ÷ 1.4.
m(N) : m(O) = 1 : 2857/ ×7.
m(N) : m(O) = 7 : 20.
