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C(s) + O2(g) → CO2(g) + 400 kJ C(s) + 1/2 O2(g) → CO(g) + 100 kJ 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 _____.
- 1600 kJ
- 3200 kJ
- 4400 kJ
- 6600 kJ
Correct answer: 6600 kJ
Solution
The total heat generated from burning 0.6 kg of coal is calculated by considering the contributions from both CO and CO2 production. With 60% of carbon producing CO (yielding 100 kJ per mole) and the remaining 40% producing CO2 (yielding 400 kJ per mole), the total heat from 0.6 kg of coal results in 6600 kJ.
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