Practice question
Question
Calculate the heat released when 22 g of CO₂ is formed from C(s) + O₂(g) → CO₂(g) . ( Δ H = -393.5 kJ/mol , molar mass of CO₂ = 44 g/mol )
Explanation
Moles of CO₂ = 22 / 44 = 0.5 mol . For C(s) + O₂(g) → CO₂(g) , Δ H = -393.5 kJ/mol . Heat released = 0.5 × 393.5 = 196.75 kJ (positive, as heat is released in exothermic reaction).
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