Объяснение:
1) Mr(Al2S3) = 27*2 + 32*3 = 150
W(Al) = Ar(Al) *n / Mr(Al2S3) *100% = 27*2 / 150 *100% = 36%
W(S)= Ar(S) *n / Mr(Al2S3) *100% = 32*3 / 150 *100% = 64%
2) Mr(AlCl3) = 27 + 35,5*3 = 133,5
W(Al) = Ar(Al) *n / Mr(AlCl3) *100% = 27 *1 / 133,5 *100% = 20%
W(Cl) = Ar(Cl) *n / Mr(AlCl3) *100% = 35,5*3 / 133,5 *100% = 80%
3) Mr(Fe2O3) = 56*2 + 16*3 = 160
W(Fe) = Ar(Fe) *n / Mr(Fe2O3) *100% = 56*2 / 160 *100% = 70%
W(O) = Ar(O) *n / Mr(Fe2O3) *100% = 16*3 / 160 *100% = 30%
