Xenon, , forms a series of compounds with fluorine. The compound containing the

Question

Xenon, , forms a series of compounds with fluorine. The compound containing the highest ratio of fluorine to xenon is . This compound reacts with liquid water to form an aqueous solution of another noble gas compound, , and hydrogen fluoride. What is the standard enthalpy for this reaction?
Express your answer to three significant figures and include the appropriate units.
Substance
(kJ/mol) XeF6(s) -357 H2O(l) 285.83 XeO3(aq) 415 (HF) 314.64

Explanation / Answer

The previous answer is incorrect. What you have to do is make sure your reaction is balanced. Balanced it is: XeF6 + 3H20 --> XeO3 + 6HF. Next, plug in the given values of enthalpy (add the sum of the products, minus the sum of the reactants) (-357+3(-285.83))- (415 + 6(-314.64)) = +258.35 kJ/mol. Hope that helps! :)

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