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A sample of mercury(II) oxide is placed in a 5.00 L evacuated container and heated until...

A sample of mercury(II) oxide is placed in a 5.00 L evacuated container and heated until it decomposes entirely to mercury metal and oxygen gas. The container is then cooled to 25 degrees C. One now finds that the gas pressure inside the container is 1.73 atm. what mass of mercury (II) oxide was originally placed into the container? my answer is 153 g.... please show work and explain

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