Question

Вычислите массовую долю каждого элемента в оксиде алюминия

Answer 1

Mr(Al2O3) = 27*2 + 16*3 = 102
W(Al) = Ar(Al) * n / Mr(Al2O3)  *100% = 27*2 / 102  *100% = 53%
W(O) = Ar(O) * n / Mr(Al2O3) *100% = 16*3 / 102  *100% = 47%

Answer 2

Mr(Al2O3)=2*27+3*16=102
W(Al)=54/102=0.5294=52.94%
W(O)=48/102=0.4706=47.06%