Use the following equation for the decomposition of mercury(II) oxide.
2HgO(s) → 2Hg() + O2(g)
In a certain reaction 3.75 g of HgO is decomposed, producing 3.21 g
of Hg.
What is the theoretical yield of Hg?
a 3.21 g Hg
b 3.47 g Hg
C4.05 g Hg
d 1.74 g Hg

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

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