A student investigates the thermal decomposition of sodium chlorate(V) to produce sodium chloride and oxygen gas:
2NaClO3(s)→2NaCl(s)+3O2(g) 2\text{NaClO}_3(\text{s}) \rightarrow 2\text{NaCl}(\text{s}) + 3\text{O}_2(\text{g}) 2NaClO3(s)→2NaCl(s)+3O2(g)During the experiment, 5.32 g of sodium chlorate(V) is heated in the presence of 1.75 g of manganese(IV) oxide (MnO2\text{MnO}_2MnO2) as a catalyst. During the reaction, 1.44 g of oxygen gas is released.
What mass of manganese(IV) oxide remains at the end of the reaction?
0.31 g0.31\text{ g}0.31 g
1.75 g1.75\text{ g}1.75 g
3.88 g3.88\text{ g}3.88 g
5.63 g5.63\text{ g}5.63 g