Problem- in 1774 joseph priestley discovered that mercuryii, Ask an Expert

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Problem- In 1774, Joseph Priestley discovered that mercury(II) oxide decomposes on heating to elemental mercury and a gas, later called oxygen. If 56.0 g of mercury(II) oxide is heated and 26.0 % of it decomposes, what is the pressure of oxygen gas in a 621 mL container at 25oC?

A.1.32 atm

B.10.1 atm

C.5.17 atm

D.2.64 atm

E.5.30 atm

Please explain how you came up with answer I really want to understand how to solve this

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