Standard entropy of crystalline carbon monoxide (in kJ/mol) at 0 K is around
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Engineering Chemistry · all questionsChemical Thermodynamics
Chemical Thermodynamics
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For an irreversible adiabatic expansion of a perfect gas from volume Vi to Vf, the change in entropy of the gas is
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The change in entropy when two moles of argon gas are heated at constant volume from 300 K to 500 K is
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For the reaction, N2(g) + 3H2(g) → 2NH3(g)
compute the entropy change (in J/K/mol) for the process and comment on the sign of the property.
compute the entropy change (in J/K/mol) for the process and comment on the sign of the property.
| Data | Species S°(J/K/mol) |
NH3(g) 192.3 |
N2(g) 191.5 |
H2(g) 130.6 |
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Given that standard molar enthalpies of formation of NO(g) and NO2(g) are respectively 90.3 kJ/mol and 33.2 kJ/mol, the enthalpy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is
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The standard free energies of formation of H2S(g) and CdS(s) at 1000°C are -49.0 kJ/mol and -127.2 kJ/mol respectively. Use these data to predict whether H2(g) will reduce CdS(s) to metallic Cd at this temperature.
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For the reaction, 2Cl(g) → Cl2(g) the thermodynamic properties
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According to conventional transition state theory, for elementary bimolecular reactions, the molar entropy of activation ΔS± is
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The enthalpy of formation of AgCl is obtained from the enthalpy change from which one of the following process?
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For the process, 1Ar(300 K, 1 bar) → 1Ar(200 K, 10 bar) assuming ideal gas behaviour, the change in molar entropy is
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The rate of evaporation of a liquid is always faster at a higher temperature because
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Choose the correct criterion of spontaneity in terms of the properties of the system alone.
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The criterion for the spontaneity of a process is
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The molar entropy of crystalline CO at absolute zero is
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Among the following, the system that would require the least amount of thermal energy to bring its temperature to 80°C is
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Among the following, the reaction that is accompanied by a decrease in the entropy is
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The criterion for spontaneous change in terms of the state functions is
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The free energy change (ΔG) of 1 mole of an ideal gas that is compressed isothermally from 1 atm to 2 atm is
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Among W (work), Q (heat), U (internal energy) and S (entropy)
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