Объяснение:
Mr(N2O3) = 14*2 + 16*3 =76
W(N) = Ar(N) *n / Mr(N2O3) *100% = 14*2 / 76 *100% = 37%
W(O) = Ar(O) *n / Mr(N2O3) *100% = 16*3 / 76 *100% = 63%
