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Enthalpy, Hess' law and cycles

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21/04/2018 9:14 am

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Hi, I'm really struggling with this question... :

Hydrogen chloride, HCl, can be made by heating potassium chloride with concentrated sulfuric acid according to the equation:
Reaction A: H2SO4 (aq) + 2KCl(s) → 2HCl(g) + K2SO4(aq)
Given the information:
Reaction B: H2SO4 (aq) + 2KOH(s) → K2SO4 (aq) + 2H2O(l) ΔHo = -342kJmol-1
Reaction C: HCl(aq) + KOH(s) → KCl(aq) + H2O(l) ΔHo= -204kJmol-1
Calculate the standard enthalpy change, in kJmol-1, of reaction A.

Any ideas?

(@maddiebudd)

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