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...wave length...? of light you could use to do so if the work function of barium is 258.9 kJ/mole? The answer is 462.1 nm but can someone please explain how to solve this. I actually want to learn! I can't figure it out though. Thanks in advance :)

Imagine a hypothetical experiment where you use 6.00 g of BaCl2 * 2H2O and excess sodium phosphate. If 27.00 % of the limiting reagent forms BaHPO4 and the rest forms Ba3(PO4)2, how many grams of precipitate would be formed in total? The theoretical yield presumes all of the limiting reagent...