GKFix MCQ Question

What is the ∆rH⁰ for the decomposition of CaCO₃(s) into CaO(s) and CO₂(g)?

• A. –178.3 kJ mol⁻¹
• B. 178.3 kJ mol⁻¹
• C. –1206.9 kJ mol⁻¹
• D. 393.5 kJ mol⁻¹