Find Δ f H ∘ for HCl ( g ) from the following data: NH 3 ( g ) + HCl ( g ) ⟶ NH 4 Cl ( s ) ; Δ r H ∘ = − 176 kJ / mole N 2 ( g ) + 3 H 2 ( g ) ⟶ 2 NH 3 ( g ) ; Δ r H ∘ = − 92 kJ / mole

Question

Find Δ f ​ H ∘ for HCl ( g ) from the following data: NH 3 ​ ( g ) + HCl ( g ) ⟶ NH 4 ​ Cl ( s ) ; Δ r ​ H ∘ = − 176 kJ / mole N 2 ​ ( g ) + 3 H 2 ​ ( g ) ⟶ 2 NH 3 ​ ( g ) ; Δ r ​ H ∘ = − 92 kJ / mole N 2 ​ ( g ) + 4 H 2 ​ ( g ) + Cl 2 ​ ( g ) ⟶ 2 NH 4 ​ Cl ( s ) ; Δ r ​ H ∘ = − 629 kJ / mole

TestHub · Accepted Answer

NH 4 ​ Cl ( s ) ⟶ NH 3 ​ ( g ) + HCl ( g ) Δ r ​ H ∘ = 176 kJ / mole NH 3 ​ ( g ) ⟶ 2 1 ​ N 2 ​ ( g ) + 2 3 ​ H 2 ​ ( g ) Δ r ​ H ∘ = 46 kJ / mole 2 1 ​ N 2 ​ ( g ) + 2 H 2 ​ ( g ) + 2 1 ​ Cl 2 ​ ( g ) ⟶ NH 4 ​ Cl ( s ) Δ r ​ H ∘ = − 314.5 kJ / mole ______________________________________________________________________________________ 2 1 ​ H 2 ​ ( g ) + 2 1 ​ Cl 2 ​ ( g ) ⟶ HCl ( g ) Δ f ​ H ∘ = − 92.5 kJ / mole

Chemistry - Thermochemistry Question with Solution | TestHub

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