Final answer:ForSolubility, the most soluble substance in the water among CO₂, N₂, Fe, Ch₃(CH₂)6CH₃, and CaCl₂ is CaCl₂. This is because it is an ionic compound that will dissociate in water, facilitating its dissolution. Thus the correct option is 5) CaCl₂.Explanation:The determination of which of these substances is most soluble in water can be guided by the concept 'like dissolves like', which meanspolar substancestend to dissolve well in polar solvents like water, and nonpolar substances in nonpolar solvents. the most soluble in water would be CaCl₂.This is because CaCl₂ is an ionic compound, and when placed into water it will dissociate into its constituent ions (Ca²+ and Cl¯). These ions will then formion-dipole interactionswith water, leading to the dissolution of CaCl₂.In contrast, substances such as CO₂, N₂, and Ch₃(CH₂)6CH₃ are covalent and either nonpolar or slightly polar, which means they do not interact with water as strongly and are therefore not as soluble. Fe, being a metal, also does not dissolve readily in water.Hence, "5) CaCl₂" is the correct option.Learn more aboutSolubilityhere:brainly.com/question/31493083#SPJ11...

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