m(Al2O3) = 321 г
M(Al2O3) = 27×2 + 16×3 = 102 г/моль
n(Al2O3) = m : M = 321 : 102 = 3,147 моль
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m(Al2O3) = 321 г
M(Al2O3) = 27×2 + 16×3 = 102 г/моль
n(Al2O3) = m : M = 321 : 102 = 3,147 моль