Final answer:
Ag2S will have the highest molar solubility in pure water because it has the highest Ksp value among the given compounds.
Step-by-step explanation:
Which of the following compounds will have the highest molar solubility in pure water?
The compound with the highest molar solubility will have the highest value of Ksp. Ksp is the solubility product constant, which is a measure of the extent to which a compound dissociates in water. The compound with the highest Ksp will have the highest molar solubility.
Comparing the given compounds, we have:
-CaCO3, Ksp = 4.96 × 10^-9
-ZnS, Ksp = 2.0 × 10^-25
-HgS, Ksp = 1.6 × 10^-54
-ZnSe, Ksp = 3.6 × 10^-26
-Ag2 S, Ksp = 6.0 × 10^-51
From the given options, Ag2S will have the highest molar solubility in pure water because it has the highest Ksp value (6.0 × 10^-51).