Chemistry - Thermochemistry Question with Solution | TestHub
An intimate mixture of carbon monoxide gas and the theoretical amount of air at 27°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. Take R = 2 cal/K-mol and 27°C = 300 K.
Given: (i) CP,m(N2) = 7.0 cal/K-mol (ii) CP,m(CO2) = 9.5 cal/K-mol (iii) CO(g) + 1/2O2(g) → CO2(g), ΔH = -34.0 kcal, independent of temperature (iv) Air contains 20% O2 and 80% N2 by volume
The values of CV,m of N2(g) and CO2(g) (in cal/K-mol) should be
Options:
Answer:
Solution:
The vessel is rigid, so the relevant heat capacities are at constant volume. For an ideal gas, CV,m = CP,m - R.
Thus, we can calculate the molar heat capacities at constant volume:
CV,m(N2) = 7.0 - 2.0 = 5.0 cal/K·mol
CV,m(CO2) = 9.5 - 2.0 = 7.5 cal/K·mol
This corresponds to option (d).
