Răspuns :
Răspuns:
4×27g.....................2×102g
4Al + 3O2 => 2Al2O3
xg.............................284g
MAl=27g/mol
MAl2O3 =2×27+3×16=102g/mol
x=284×4×27/2×102=150,35 gAl
Răspuns:
2,78 moli Al₂O₃
Explicație:
M(Al₂O₃) = 2 × A(Al) + 3 × A(O) = 2 × 27 + 3 × 16 = 102 g/mol
1 mol Al₂O₃..........102g Al₂O₃
x mol Al₂O₃..........284g Al₂O₃
x = 284 : 102 = 2,78 moli Al₂O₃
-Mihai