2HgO(s) ------------> Hg(l) + O2(g)
2 x 216.6 g HgO gives 1 mole O2
53.4 g HgO gives 53.4 x 1 / 2 x 216.6 = 53.4 / 433.2 = 0.123 moles O2
PV = nRT
V = nRT / P
V = 0.123 x 0.0821 x 298 / 1
V = 3.01 L O2
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