what is the final pressure of the oxygen gas at 50.63 °C? (more info in details)...?
In one of his most critical studies into the nature of combustion, Lavoisier heated mercury (II) oxide and isolated elemental mercury and oxygen gas. If 39.61 g mercury (II) oxide are heated in a 561.6 mL vessel and 65.9 % (by mass) decomposes, what is the final pressure of the oxygen gas at 50.63 °C? (Assume the gas occupies the entire volume.)
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2 HgO → 2 Hg + O2
(39.61 g HgO) / (216.5914 g HgO/mol) x (0.659) x (1 mol O2 / 2 mol HgO) = 0.0602586 mol O2
P = nRT / V = (0.0602586 mol) x (0.08205746 L atm/K mol) x
(50.63 + 273.15 K) / (0.5616 L) = 2.85 atm O2