Дано:
Fe(OH)2
Найти:
ω (Fe)=? ω (O)=? ω (Н)=?
ω х/э = Ar * n / Mr * 100%
Mr (Fe(OH)2) = Ar (Fe) + Ar (O)*2 + Ar (H)*2 = 56 + 16*2 + 1*2 = 90
ω (Fe)= 56*1/90 * 100% = 62.2 %
ω (O) = 16*2/90 * 100% = 35.6 %
ω (H) = 1*2 / 90 * 100% = 2.2%
Проверка: 62.2 % + 35.6 % + 2.2% = 100%
Oтвет: ω (Fe)= 62.2% ω (O) =35.6% ω (H) = 2.2%
