For the an initial question, we desire to look at potential intermolecular pressures that are acting to hold the molecules together. The one through the weakest IMF will have actually the lowest boiling point.

You are watching: Which of the following should have the lowest boiling point

CH4 has actually only dispersion pressures while all the others have dispersion PLUS either dipole-dipole (HCl, H2S, NH3), and/or hydrogen bonding (NH3). So, CH4 will have actually the lowest boiling point.

For the 2nd question, we want to look for the molecule that dissociates/ionizes right into the most number of ions. This will certainly be NaCl(l) because solids don"t execute so and H2O(g) just ionizes ever before so slightly.

So, the answer is NaCl(l) is the ideal conductor.

upvoted • 2 Downvote
comments • 2

Salo O.

Hello, give thanks to you! Also, for the second question, can you determine the prize by detect what pressures the molecules has, whether it is dispersion or dipole-dipole or hydrogen bonding and also then recognize the ideal conductor that electricity?

J.R. S.

not really. As much as electrical conductivity, girlfriend are an ext interested in intramolecular pressures than you space in intermolecular forces, and likewise the number of ions present. Because that example, 1 M CaCl2 is a much better conductor 보다 1 M NaCl because it produces much more ions.

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