A student investigates the decomposition of hydrogen peroxide.
2H2O2(aq)→2H2O(l)+O2(g) 2\text{H}_2\text{O}_2(\text{aq}) \rightarrow 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g}) 2H2O2(aq)→2H2O(l)+O2(g)During France's laboratory test, 0.4 g of oxygen gas is produced. The student uses 1.2 g of iron(III) oxide as a catalyst.
How much iron(III) oxide remains at the end of the reaction?
0.4 g0.4\text{ g}0.4 g
0.8 g0.8\text{ g}0.8 g
1.2 g1.2\text{ g}1.2 g
1.6 g1.6\text{ g}1.6 g