а) Fe2O3 = 56*2 + 16*3 = 112 + 48 = 160
б)Fe3O4 = 56*3 + 16*4 = 168 + 64 = 232
в)CaCO = 40 + 12 + 16 = 68
г)Na2SO4 = 23*2 + 32 + 16*4 = 46+32+64= 142
Объяснение:
Mr(Fe2O3) = 56*2+16*3=160
Mr(Fe3O4) = 56*3 + 16*4 = 232
Mr(CaCO3) = 40 + 12 + 16*3 = 100
Mr(Na2SO4) = 23*2 + 32 + 16*4 =142
а) Fe2O3 = 56*2 + 16*3 = 112 + 48 = 160
б)Fe3O4 = 56*3 + 16*4 = 168 + 64 = 232
в)CaCO = 40 + 12 + 16 = 68
г)Na2SO4 = 23*2 + 32 + 16*4 = 46+32+64= 142
Объяснение:
Mr(Fe2O3) = 56*2+16*3=160
Mr(Fe3O4) = 56*3 + 16*4 = 232
Mr(CaCO3) = 40 + 12 + 16*3 = 100
Mr(Na2SO4) = 23*2 + 32 + 16*4 =142