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дано

m(FeO) = 144g

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M(Fe)-?

3FeO+2Al-->Al2O3+3Fe

M(FeO) = 72 g/mol

n(FeO) = m/M = 144 / 72 = 2 mol

3N(FeO) = 3n(Fe) = 2 mol

M(Fe) = 56 g/mol

m(Fe) = n*M =2*56 = 112 g

ответ 112 г