9. Tính:
- Hợp chất Al2O3:
%Al = $\frac{KLNT(Al.2)}{KLPT(Al_{2}O_{3})}$ . 100% = $\frac{27 . 2}{27 . 2 + 16 . 3}$ . 100% ≈ 52,94%
%O = $\frac{KLNT(O.3)}{KLPT(Al_{2}O_{3})}$ . 100% = $\frac{16 . 3}{27 . 2 + 16 . 3}$ . 100% ≈ 47,06%
- Hợp chất MgCl2:
%Mg = $\frac{KLNT(Mg)}{KLPT(MgCl_{2})}$ . 100% = $\frac{24}{24 + 35,5 . 2}$ . 100% ≈ 25,26%
%Cl = $\frac{KLNT(Cl.2)}{KLPT(MgCl_{2})}$ . 100% = $\frac{35,5 . 2}{24 + 35,5 . 2}$ . 100% ≈ 74,74%
- Hợp chất Na2S:
%Na = $\frac{KLNT(Na.2)}{KLPT(Na_{2}S)}$ . 100% = $\frac{23 . 2}{23 . 2 + 32}$ . 100% ≈ 58.97%
% S= $\frac{KLNT(S)}{KLPT(Na_{2}S)}$ . 100% = $\frac{32}{23 . 2 + 32}$ . 100% ≈ 41,03%
- Hợp chất (NH4)2CO3:
%N = $\frac{KLNT(N.2)}{KLPT({(NH_{4})}_2CO_{3})}$ . 100% = $\frac{14 . 2}{(14 + 1 . 4) . 2 + 12 + 16 . 3}$ . 100% ≈ 29,2%
%H = $\frac{KLNT(H.4.2)}{KLPT({(NH_{4})}_2CO_{3})}$ . 100% = $\frac{1 . 4 . 2}{(14 + 1 . 4) . 2 + 12 + 16 . 3}$ . 100% ≈ 8,3%
%C = $\frac{KLNT(C)}{KLPT({(NH_{4})}_2CO_{3})}$ . 100% = $\frac{12}{(14 + 1 . 4) . 2 + 12 + 16 . 3}$ . 100% = 12.5%
%O = $\frac{KLNT(O.3)}{KLPT({(NH_{4})}_2CO_{3})}$ . 100% = $\frac{16 . 3}{(14 + 1 . 4) . 2 + 12 + 16 . 3}$ . 100% = 50%