Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of FormationHard2 minQB
ChemistryHardnumerical
Enthalpy of the reaction: Ag+(aq) + I-(aq) → AgI(s) is -86.0 kJ. Magnitudes of enthalpies of formation of Ag+(aq) and I-(aq) are in 3:5 ratio but their signs are opposite. Enthalpy of formation of AgI(s) is -120.0 kJ/mol. The magnitude of enthalpy of formation of Ag+(aq) (in kJ/mol) is
Answer:
51.00
Solution:
Let Δf H(Ag+) = 3k and Δf H(I-) = -5k (the opposite sign choice gives k = -17, not allowed). -86.0 = -120.0 - (3k - 5k) = -120.0 + 2k, so k = 17. Magnitude for Ag+ = 3 × 17 = 51 kJ/mol. The answer is 0051.
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Formation
⏱ 2mℹ️ Source: QB
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