[oceanmd]

Iron metal reacts with O₂ and produces 30 g iron (III) oxide. How many moles of iron does 30 g iron oxide contains?

Equation: 4Fe + 3O₂ = 2Fe₂O₃

1 mol of Fe₂O₃ = 159.7 g
x mol of Fe₂O₃ = 30 g

x = 30g /159.7 g = 0.188 mol

4 mol of Fe = 2 mol of Fe₂O₃, proportionately it's 0.188 x 2 = 0.3757 moles of iron

Please, if it is incorrect, explain where I am wrong. Thank you

[Borek]

Looks OK. Watch sig figs.

[oceanmd]

Thank you