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ChemistrySingle correct+4 / -1Question 63 of 90

JEE Main 2022 · 29 Jul · Shift 2, Chemistry question 63

C(s)+O2(g)→CO2(g)\mathrm{C(s)+O_2(g)\to CO_2(g)} + 400 kJ
C(s)+12O2(g)→CO(g)\mathrm{C(s)+\frac12O_2(g)\to 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_2'. The heat generated when 0.6 kg of coal is burnt is _______.

Choose one option
Answer and worked solution

Official answer: D

Carbon 0.6×0.6=0.360.6\times0.6=0.36 kg = 30 mol: 18 mol to CO (1800 kJ) and 12 mol to CO₂ (4800 kJ). Total 6600 kJ.

(D)

Topics:Hess's law and enthalpies of reactionStoichiometry
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