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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
In an insulated container, a hot piece of iron (cp =0.4513 J/g-C) at 1490. C was added to 200. g of water (cp =4.184 J/g-C) at 20. C. The temperature of the resulting mixture became 90. C. What mass of iron was present?
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