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Which pair of molecules has the strongest dipole-dipole interactions?

a- CO2 and CO2
b- CO2 and CH4
c- NH3 and NH3
d- NH3 and CH4
e- CH4 and CH4

how do you figure out the answer to this question?

  • Chemistry -

    1. You know what makes a dipole.
    2. You review to see which has two dipoles.

    Symmetry is a big clue in this. CO2 are linear molecules, CH4 is a symmetrical (tetrahedral) molecule, and NH3 is not symmetrical, with a double unshared pair of electrons on one side.

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