When mercury (ii) oxide is heated it decomposes into mercury and

When mercury (II) oxide is heated it decomposes into mercury and oxygen gas according to the following BALANCED equation. 2 HgO à 2 Hg + O2 Given that the density of oxygen is 1.439 g/L, how many liters of oxygen gas can be produced if 1.0 moles of mercury (II) oxide are heated?