For which of the following reactions is delta h of rxn equal to delta h of f of

Question

For which of the following reactions is delta h of rxn equal to delta h of f of the product(s)? Part A For which ofthe flowing reactor isasr_oquai to cf You do nof need to look up any vakues to answer tis question Check all that apply. producor no tlanded heat of brukn, H7. is defned the erth-py change loe the fermation of one mole of substance from its constituent elements in hor standard slales. Thhes, elemonts in their standard states have enthalpy change of any seaction Consider, for exampie, the reacton Hinte Hint 1. How to approach the problem (olck to epen) Hint 2, Select the reaction for the formation of sodium tuorde ow Hint 3. Select the reaction for the formation of sulfur dlaxde (cktopen) with heal of formation values given by the foBowing table Substance &J;/mob NO) 90.:2 0) NO () 332 Then the slandard heal of reaction for the everall reaction is 11 117(produts). 2(33.2) -114 kJ 117(reactants) 2(00.2)+ -12(90.2) + = Na(s) + P2 (1)NaF(s) = Na(s) +P2(g)--Nar(s)

Explanation / Answer

H°rxn = H°f ( products) - H°f(reactantst)

For elements Hf° = 0

Therefore,

H°rxn of reactions between two elements in their standard states will equal to H°f of products

So the following 3 reactions are the answer

2Na(s) + F2(g) ------> 2NaF(s)

S(s) + O2(g) ------> SO2(g)

Na(s) + 1/2F2(g) ------> NaF(s)

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