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Enthalpy, Hess' law and cycles  

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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?

 
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