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How do you express this in kilocalories per mole?
Express the 7.84eV ionic cohesive energy of NaCl in kilocalories per mole of ions.
Well, you simply look up some conversion factors:
a kilocalorie is equal to 4.2kJ and 1 eV is equal to ~1.602×10^-19 joules
You need to express it amount of energy (kilocalories) per mole so you multiply the cohesive energy of one NaCl by a mole
7.84eV x mole = 756,000 joules
Then convert to kilocalories
756kJ/4.2kJ => 180 kilocalories per mole
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