First slide

Enthalpy of formation

Question

If S + O₂ → SO₂ ; ΔH = – 398.2 KJ
SO₂ + 1/2O₂ → SO₃ ; ΔH = – 98.7 KJ
SO₃ + H₂O → H₂SO₄; ΔH = – 130.2 KJ
H₂ + 1/2O₂ → H₂O ; ΔH = – 227.3 KJ
The enthalpy of formation of sulphuric acid at 298 K will be

Moderate

A

-854.4 K.J
B

-754.4 K.J
C

-650.3 K.J
D

-433.7 K.J

Solution

$\begin{gathered} {H_2} + 2{O_2} + S \to {H_2}S{O_4};\,\,\Delta {H_f} = ? \\ \Delta {H_f}({H_2}S{O_4}) = \Delta {H_1} + \Delta {H_2} + \Delta {H_3} + \Delta {H_4} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \, - 854.4KJ \\ \end{gathered}$

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