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MDCAT Chemistry Paper 2025 #Enthalpy #Thermochemistry & Thermodynamics

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The heat of formation of CO and CO₂ are -26.4 Kcal and -94.0 Kcal respectively. The heat of combustion of carbon monoxide according to Hess's Law will be: (IBA MDCAT 2025)

Verified Answer & Explanation⌄

Correct Answer: B) -67.6 Kcal

Concept Explanation

For CO + 1/2 O₂ → CO₂, ΔH = ΔHf(CO₂) − ΔHf(CO) = −94.0 − (−26.4) = −67.6 kcal.

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