Consider the reaction, C + O2 ⇌ CO2; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?
Correct answer: B. +94 kcal
- A. -94 kcal
- B. +94 kcal
- C. > 94 kcal
- D. < -94 kcal
Explanation
Reversing a reaction reverses the sign of its enthalpy change, so decomposition of CO₂ requires +94 kcal. The magnitude remains unchanged for the reverse reaction.
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