C(s) + O2(g) CO2(g) + 400\,kJ; C(s) + 12O2(g) CO(g) + 100\,kJ When coal of purity 60% is allowed to burn in presence of…
Thermodynamics · Class 11 · JEE Main Previous Year Question
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When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into 'CO' and the remaining is converted into 'CO₂'. The heat generated when 0.6 kg of coal is burnt is:
- a
1600 kJ
- b
3200 kJ
- c
4400 kJ
- d✓
6600 kJ
6600 kJ
🧠 Two combustion pathways: scale each by the moles that follow that path Pure carbon content determines total moles. Those moles split between CO and formation according to the given percentages, each releasing different heat per mole.
🗺️ Calculation Pure carbon in 0.6 kg of 60% purity coal:
Forming CO (60%):
Forming (40%):
Total =
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