4)<span>1.24⋅<span>1024</span></span><span> formula units
</span>1 mole Na<span> (sodium)</span>
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Add up the molar mass of Mercury Oxide, and then divide the molar mass of Oxygen by the molar mass of the compound.
So...
mm of Hg + mm of O= 200.59g + 16g= 217g
16g/217g = .0737... x 100 = 7.37%
Answer:
b,d,f
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