Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of CombustionMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
When 12 g of carbon reacted with oxygen to form CO and CO2 at 298 K and constant pressure, 53.2 kcal of heat was liberated and no carbon remained. Heat of formation of CO and CO2 are -26.0 and -94.0 kcal/mole, respectively.
Mass of oxygen reacted with carbon is
Options:
Answer:
D
Solution:
For 0.6 mol of CO, 0.5 × 0.6 = 0.3 mol of O₂ is needed.
For 0.4 mol of CO₂, 0.4 mol of O₂ is needed.
The total amount of O₂ required is 0.3 + 0.4 = 0.7 mol.
The mass of O₂ is 0.7 mol × 32 g/mol = 22.4 g.
This corresponds to option (d).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Combustion
⏱ 2mℹ️ Source: QB
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