A student determines the iron (II) content of a solution by first precipitating it as iron (II) hydroxide, and then decomposing the hydroxide to iron (II) oxide by heating. How many grams of iron (II) oxide should the student obtain if her solution contains 46.0 mL of 0.426 M iron(II) nitrate?

Answer 1

Fe(NO3)2 + 2OH^- ==> Fe(OH)2 + 2NO3^-
Then Fe(OH)2 + heat ==> FeO + H2O
mols Fe(NO3)2 = mols x L = ?
mols FeO = mols Fe(NO3)2 (look at the equation; 1 mol Fe(NO3)2 = 1 mol FeO)
Then g Fe) = mols FeO x molar mass FeO.