Based on the information given, it should be noted that there'll be 0.06537 moles of HgS and 0.13074 moles of the remaining compound.
Precipitation simply means the process of transforming a dissolved substance into an insoluble solid. It's the conversion of a solution into a solid.
From the complete information, it can be inferred from the reaction that was balanced that there'll be 0.06537 moles of HgS and 0.13074 moles of the remaining compound. This shows the moles of each ion that remains.
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