Объяснение:
Mr(CaCO3) = 40 + 12 + 16*3 = 100
W(O) = Ar(O) *n / Mr(CaCO3) *100% = 16*3 / 100 *100% = 48%
Mr(Na2O) = 23*2 + 16 = 62 г/моль
W(O) = Ar(O) *n / Mr(Na2O) *100% = 16*1 / 62 *100% =26%
Mr(HNO3) = 1+14 + 16*3 = 63
W(O) = Ar(O) *n / Mr(HNO3) *100% = 16*3 / 63 *100% =76%
