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For which of the following reactions is ΔrH∘ΔrH∘ equal to ΔfH∘ΔfH∘ of the product(s)? You do...

For which of the following reactions is ΔrH∘ΔrH∘ equal to ΔfH∘ΔfH∘ of the product(s)?

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H2O2(g)→12O2(g)+H2O(g)H2O2(g)→12O2(g)+H2O(g)
2H2(g)+O2(g)→2H2O(g)2H2(g)+O2(g)→2H2O(g)
2Na(s)+F2(g)→2NaF(s)2Na(s)+F2(g)→2NaF(s)
Na(s)+12F2(g)→NaF(s)Na(s)+12F2(g)→NaF(s)
H2(g)+12O2(g)→H2O(g)H2(g)+12O2(g)→H2O(g)
Na(s)+12F2(l)→NaF(s)
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