Question

4.
It has been found that gaseous iodine molecule
just dissociates into iodine atoms after absorption
of light at wavelengths 4995 A. The energy required
to dissociate 1 mole of iodine molecules is
(1) 52.2 kcal/mole
(2) 93.4 kcal/mole
(3) 63.4 kcal/mole
(4) 57.3 kcal/mole
how to convert joule into kcal?
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Answer 1

Answer:

noo because i dont knoe