Предмет: Химия, автор: albinaurish

К раствору содержащему соль нитрата железа (2) массой 142 г прилили щелочь NaOH. Найдите массу полученного осадка

Ответы

Автор ответа: MrsRasta

2NaOH + Fe(NO3)2 = Fe(OH)2↓ + 2NaNO3
n(Fe(NO3)2)=142/180=0,78(моль)
n(Fe(NO3)2)=n(Fe(OH)2)=0,78(моль)
m(Fe(OH)2)=0,78*90=70,2(г)
Ответ: m(Fe(OH)2)=70,2

Автор ответа: DJToxa

Дано:
m[Fe(NO₃)₂]=142г
Найти:
m[Fe(OH)₂]-?
Решение:
Fe(NO₃)₂+2NaOH--->Fe(OH)₂↓+2NaNO₃
M[Fe(NO₃)₂]=180г/моль
M[Fe(OH)₂]=90г/моль
Составляем массовую пропорцию:
142г --- 180г/моль
Х г --- 90г/моль
Х=142*90/180=71г
m[Fe(OH)₂]=Х=71г
Ответ:71г

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