Chemical Engineering Thermodynamics The expression for entropy change given by, ΔS = nR ln (V₂/V₁) + nCv ln (T₂/T₁) is valid for Heating of a substance Reversible isothermal volume change Cooling of a substance Simultaneous heating and expansion of an ideal gas Heating of a substance Reversible isothermal volume change Cooling of a substance Simultaneous heating and expansion of an ideal gas ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics In the reaction, C + O₂ → CO₂ ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O₂? > -94 kcal -94 kcal < - 94 kcal Zero > -94 kcal -94 kcal < - 94 kcal Zero ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics Boyle's law for gases states that P ∝ 1/V, when temperature & mass of the gas remain constant P/V = constant, for any gas P ∝ V, at constant temperature & mass of the gas P ∝ 1/V, when temperature is constant P ∝ 1/V, when temperature & mass of the gas remain constant P/V = constant, for any gas P ∝ V, at constant temperature & mass of the gas P ∝ 1/V, when temperature is constant ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics All gases during throttling process at atmospheric temperature and pressure show a cooling effect except N₂ CO₂ H₂ O₂ N₂ CO₂ H₂ O₂ ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics Refrigerants commonly used for domestic refrigerators are Freon-12 Ethyl chloride or methyle chloride Propane NH₃ or CO₂ Freon-12 Ethyl chloride or methyle chloride Propane NH₃ or CO₂ ANSWER DOWNLOAD EXAMIANS APP
Chemical Engineering Thermodynamics A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system U and S both decreases Its internal energy (U) decreases and its entropy (S) increases U decreases but S is constant U is constant but S decreases U and S both decreases Its internal energy (U) decreases and its entropy (S) increases U decreases but S is constant U is constant but S decreases ANSWER DOWNLOAD EXAMIANS APP
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