M(Fe3O4) = 56*3 + 16 * 4 = 232 g/mol
n(Fe3O4) = m / M = 3.48 / 232 = 0.015 mol
ответ 0.015 моль
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M(Fe3O4) = 56*3 + 16 * 4 = 232 g/mol
n(Fe3O4) = m / M = 3.48 / 232 = 0.015 mol
ответ 0.015 моль