Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of ReactionMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
An intimate mixture of hydrogen gas and the theoretical amount of air at 25°C and a total pressure of 1 atm, is exposed in a closed rigid vessel. If the process occurs under adiabatic condition, then using the following data, answer the following questions:
Given: (i) CP,m = 8.3 cal/K-mol (ii) CP,m = 11.3 cal/K-mol (iii) Δf H [H2O(g)] = -57.8 kcal (iv) Air contains 20% O2 and 80% N2 by volume
The values of CP,m of N2(g) and H2O(g) (in cal/K-mol) should be
Options:
Answer:
B
Solution:
N₂ is diatomic, while H₂O(g) is a nonlinear triatomic molecule. Consequently, H₂O possesses more modes to store energy, resulting in a larger heat capacity. Therefore, CP,m(N2) = 8.3 and CP,m(H2O) = 11.3 cal/K-mol. This corresponds to option (b).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction
⏱ 2mℹ️ Source: QB
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