489 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26PH0573 · Delta S0univ for the following reaction, at 298 K is: N2 + 3H2 → 2NH3 Delta S0sys = -197 J K-1, Delta H0sys = -91.8 kJ · Thermodynamics – General
ABC26PH0576 · The expression which represents the chemical potential of the ith sp species (mu i) in a mixture (i ≠ j) is · Partial Molar Quantities
ABC26PH0577 · The temperature of 54 g of water is raised from 15°C to 75°C at constant pressure. The change in the enthalpy of the system (given that… · Laws State Functions
ABC26PH0578 · The specific volume of liquid water is 1.001 mL g-1 and that of ice is 1.0907 mL g-1 at ° C. If the heat of fusion of ice at this… · Thermochemistry
ABC26PH0579 · The entropy of mixing of 10 moles of 10 moles of helium and 10 moles of oxygen at constant temperature and pressure, assuming both to be… · Laws State Functions
ABC26PH0580 · The correct statement(s) among the following is/are (i) The vibrational energy levels of a real diatomic molecule are equally spaced. (ii)… · Free Energy Equilibria
ABC26PH0581 · The residual entropy of the asymmetric molecule N2O in its crystalline state is 5.8 J K-1 mol-1 at absolute zero. The number of… · Laws State Functions
ABC26PH0582 · If a gas obeys the equation of state P(V - nb) = nRT, the ratio ((CP - CV))/((CP - CV)ideal) is: · Thermodynamics – General
ABC26PH0583 · Among the following the system that would require the least amount of thermal energy to bring its temperature to 80°C. · Thermodynamics – General
ABC26PH0584 · Among the following, the reaction that is accompanied by a decrease in the entropy is · Laws State Functions
ABC26PH0586 · The free energy change (Delta G) of 1 mole of an ideal gas that is compressed isothermally from 1 atm to 2 atm is: · Free Energy Equilibria
ABC26PH0587 · The molar entropy of crystalline CO at absolute zero is · Laws State Functions
ABC26PH0588 · For an ideal gas · Thermodynamics – General
ABC26PH0589 · Among W (work), Q (heat), U (internal energy) and S (entropy) · Laws State Functions
ABC26PH0590 · The change in entropy when two moles of Argon gas are heated at constant volume from 300 K to 500 K is: · Laws State Functions
ABC26PH0591 · At any temperature T, fugacity coefficient (gamma) is given by ln gamma =∫0P(Z-1)/(P') dP' where Z is the compressibility factor. The… · Thermodynamics – General
ABC26PH0592 · ((∂ G)/(∂ P))T = · Thermodynamics – General
ABC26PH0593 · For the process 1 Ar(300 K, 1 bar) → 1 Ar(200 K, 10 bar) assuming ideal gas behavior, the change in molar entropy is: · Laws State Functions
ABC26PH0594 · For the reaction X2 O4() → 2 XO2(g) at 298 K, given the values, Delta U=9 kJ and Delta S=84 JK-1, Delta G is · Thermodynamics – General
ABC26PH0596 · The maximum non-PV work that a system can perform at constant P is · Thermodynamics – General
ABC26PH0597 · Consider the reaction: A + B ⇌ C The unit of the thermodynamic equilibrium constant for the reaction is · Free Energy Equilibria
ABC26PH0598 · A Carnot engine operates at 55% efficiency. If the temperature of reject steam is 105°C, then the absolute temperature of input steam is… · Thermodynamics – General
ABC26PH0599 · 33.2 kJ mol-1, the enthalpy change for the reaction 2NO(g)+O2(g)(g)→ 2NP2(g) is · Thermodynamics – General
ABC26PH0600 · Which one of the following defines the absolute temperature of a system? · Thermodynamics – General
ABC26PH0604 · Of the following inequalities, the criteria for spontaneity of a chemical reaction is/are (i) (Delta G)T,P < 0 (ii) (Delta U)S,V > 0 (iii)… · Thermodynamics – General
ABC26PH0606 · For a system subjected to only P-V work, entropy is given by (I) - ((∂ G)/(∂ T))P (II) ((∂ G)/(∂ P))T (III) - ((∂ A)/(∂ V))T (IV) - ((∂… · Laws State Functions
ABC26PH0607 · Consider an ideal gas of volume V at temperature T and pressure P. If the entropy of the gas is S, the partial derivative (∂ P/∂ S)V is… · Laws State Functions
ABC26PH0608 · The standard Gibbs free energy change of the reaction shown below is -2.7 kJ mol-1. Sn(s) + Pb2+ = Sn2+ + Pb(s) Given that E0(Pb2+/Pb) is… · Free Energy Equilibria
ABC26PH0610 · Two moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under… · Laws State Functions
ABC26PH0612 · The entropy change for the melting of 'x' moles of ice (heat of fusion is 80 cal g-1) at 273 K and 1 atm pressure is 28.80 cal K-1. The… · Laws State Functions
ABC26PH0613 · An ideal gas occupies an unknown volume V liters (L) at a pressure of 12 atm. The gas is expanded isothermally against a constant external… · Thermodynamics – General
ABC26PH0615 · When three moles of helium is mixed with one mole of neon at constant temperature and pressure (25°C, 1 atm), the entropy of mixing (in… · Laws State Functions
ABC26PH0616 · Delta Gf0 and Delta Hf0 for Fe(g) are 370.7 kJ mol-1 and 416.3 kJ mol-1 at 298 K, respectively. Assuming Delta Hf0 is constant in the… · Thermodynamics – General
ABC26PH0617 · The van der Waals constants a and b for gaseous CO are given as 1.49 L2 atm mol-2 and 0.0399 L mol-1, respectively. The fugacity (in atm… · Thermodynamics – General
ABC26PH0618 · A reversible heat engine absorbs 20 kJ of heat from a source at 500 K and dissipates it to the reservoir at 400 K. The efficiency of the… · Thermodynamics – General
ABC26PH0619 · 2L of gas at 1 atm pressure is reversibly heated to reach a final volume of 3.5 L. The absolute value of the work done on the gas (rounded… · Thermodynamics – General
ABC26PH0620 · The change in enthalpy (Delta H) for the reaction 2P(s) + 3Br2(l) → 2PBr3(l) is –243 kJ. In this reaction, if the amount of phosphorus… · Laws State Functions
ABC26PH0626 · (355.1 kJmol-1) · Thermodynamics – General
ABC26PH0627 · (f=88.47 atm) · Thermodynamics – General