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but for me it's still kilocalories/mol.
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Okay, this is a logarithmic scale, so it covers a very wide range.
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Now Coulomb, if you have a proton and an electron,
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as far apart as the distance of the carbon-carbon bond,
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that's 216 kilocalories/mol,
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right in the middle of this, or near the middle.
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Magnetic interaction is much weaker.
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If you have two electron spins, at the same distance from one another,
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their energy is what?
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One, two, three, four, five orders of magnitude smaller,
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10^5th smaller.
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The "strong" binding that holds