Which of the following would be the best solvent for NH3 and why?

CH3(CH2)4CH3, CCl4, CH3OH, BrCH2CH2CH3.

As an educated guess, I would guess CH3OH. Since NH3 is a slightly polar solvent, I would rule out solvent 1 and 2 in your list. Of the two remaining, CH3OH probably is more polar than the other one.

2HCI(g)

To determine the best solvent for NH3 (ammonia), we need to consider the solubility of ammonia in each of the given solvents.

Solubility refers to how much of a substance can dissolve in a given solvent. In this case, we are interested in finding a solvent in which ammonia will dissolve to a significant extent.

One way to determine the solubility of ammonia in a solvent is by checking the polarity of the solvent. Ammonia (NH3) is a polar molecule, which means it has a slight positive charge on its hydrogen atoms and a slight negative charge on its nitrogen atom. To dissolve a polar substance like ammonia, it generally requires a polar solvent that can interact with the charges.

Now let's consider the given solvents:

1. CH3(CH2)4CH3 (hexane) is a nonpolar solvent. Nonpolar solvents do not interact well with polar substances like ammonia, so hexane is not likely to be a good solvent for NH3.

2. CCl4 (carbon tetrachloride) is also a nonpolar solvent. Like hexane, carbon tetrachloride is not expected to dissolve ammonia effectively due to its nonpolar nature.

3. CH3OH (methanol) is a polar solvent. Methanol does have a partial positive charge on its carbon and a partial negative charge on its oxygen. These polar features make methanol a better candidate for dissolving ammonia compared to the nonpolar solvents mentioned earlier.

4. BrCH2CH2CH3 (1-bromobutane) is a nonpolar solvent. Similar to hexane and carbon tetrachloride, 1-bromobutane is unlikely to dissolve ammonia well because of its nonpolar nature.

Based on the information above, the best solvent for NH3 from the given options would be CH3OH (methanol) as it is a polar solvent that can interact more effectively with the polar properties of ammonia.

To verify this information or explore other solvents, it is often helpful to consult solubility tables or experimental data on the solubility of ammonia in various solvents.