mercuric oxide on heating gives mercury and oxygen

Mercury oxide when heated in air will decompose to give elemental mercury, a liquid metal, and oxygen gas. But you really should have specified whether it is mercury (II) oxide or mercury (I) oxide. 

The balanced equation for mercury (II) oxide: 
2HgO + heat ---> 2Hg + O2 

Adding state symbols, 
2HgO (s) + heat ---> 2Hg (l) + O2 (g) 

The balanced equation for mercury (I) oxide: 
2 (Hg2O) + heat ---> 4Hg + O2 

Adding state symbols: 
2(Hg2O) (s) + heat ---> 4Hg (l) + O2 (g)
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