Calculate the enthalpy of formation of O H − ions from the following thermochemical data: H 2 O ( l ) → H + ( a q ) → O H − ( a q ) ; Δ H 298 K ∘ = + 57.32 k J H 2 ( g ) + 2 1 O 2 ( g )

Question

Calculate the enthalpy of formation of O H − ions from the following thermochemical data: H 2 ​ O ( l ) → H + ( a q ) ​ → O H − ( a q ) ​ ; Δ H 298 K ∘ ​ = + 57.32 k J H 2 ​ ( g ) + 2 1 ​ O 2 ​ ( g ) → H 2 ​ O ( l ) ; Δ H 298 K ∘ ​ = − 285.83 k J

TestHub · Accepted Answer

H₂O(l) → H⁺(aq) + OH⁻(aq) Δ H ∘ = 57.32 ∑ Δ H f ∘ ​ ( P ro d u c t ) − ∑ Δ H f ∘ ​ ( re a c tan t ) 57.32 = Δ H f ∘ ​ ( O H − ) + 285.83 △ H ∘ f ​ ( O H − ) = − 228.51 K J

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