Determine the mass (in grams) of fluorine that will result in a change in energy of -13.72 kJ when fluorine reacts with

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Determine the mass (in grams) of fluorine that will result in a
change in energy of -13.72 kJ when fluorine reacts with excess
water according to the following balanced thermochemical
equation:



2H2O(l) + 2F2(g) →
4HF(g) + O2(g) ΔHr° =
-518.54 kJ



Report your answer to three significant figures.