4. The standard Gibbs energy of formation of PH3(g) is 13.4 kJ/mol at 298 K. Note that the standard state of phosphorus at 298 K is P4(s). If H2(g) and PH3(g) are treated as perfect gases, and their partial pressures are both 2.0 bar: (a) What is the reaction quotient, Q? (b) What is the corresponding reaction Gibbs energy for the reaction corresponding to the standard Gibbs energy of formation of PH3(g)? (c) What is the spontaneous direction of the reaction?

4. The standard Gibbs energy of formation of PH3(g) is 13.4 kJ/mol at 298 K. Note that the standard state of phosphorus at 298 K is P4(s). If H2(g) and PH3(g) are treated as perfect gases, and their partial pressures are both 2.0 bar: (a) What is the reaction quotient, Q? (b) What is the corresponding reaction Gibbs energy for the reaction corresponding to the standard Gibbs energy of formation of PH3(g)? (c) What is the spontaneous direction of the reaction?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 91QRT: Actually, the carbon in CO2(g) is thermodynamically unstable with respect to the carbon in calcium...

See similar textbooks

Similar questions

Actually, the carbon in CO2(g) is thermodynamically unstable with respect to the carbon in calcium carbonate(limestone). Verify this by determining the standardGibbs free energy change for the reaction of lime,CaO(s), with CO2(g) to make CaCO3(s).
Consider the reaction NH4+(aq) H+(aq)+NH3(aq) Use G f for NH3(aq) at 25C=26.7 kJ/mol and the appropriate tables to calculate (a) G at 25C (b) Ka at 25C
Describe a nonchemical system that is not in equilibrium, and explain why equilibrium has not been achieved.
For the system 2SO3(g)2SO2(g)+O2(g) K=1.32 at 627. What is the equilibrium constant at 555C?
Certain bacteria in the soil obtain the necessary energy for growth by oxidizing nitrite to r nitrate: 2NO2- (aq) + O2(g) —> 2NO3-(aq) Given that the standard Gibbs energies of formation of NO2- and NO3- are -34.6 kJ mol-1 and -110.5 kJ mol-1, respectively, calculate the amount of Gibbs energy released when 1 mole of No2- is oxidized to 1 mole of NO3-.
For the reaction N2 (g) + 3H2(g) --> 2 NH3 (g), (a) what is the reaction Gibbs free energy at equilibrium in J/mol? The equilibrium constant of the reaction N2 (g) + 3H2(g) --> 2 NH3 (g) at 81 oC is Keq = 478,789. (b) What is the standard reaction Gibbs energy of this reaction in J/mol?
The standard Gibbs energy of formation of NH3(g) is −16.5 kJ mol−1 at 298 K. What is the corresponding reaction Gibbs energy when the partial pressures of the N2, H2, and NH3 (treated as perfect gases) are 3.0 bar, 1.0 bar, and 4.0 bar, respectively? What is the spontaneous direction of the reaction in this case?
4.32) Certain bacteria in soil obtain the necessary energy for growth by oxidizing nitrite to nitrate: 2NO2- (aq) + O2 (g) —-> 2NO3- Given that the standard Gibbs energies of formation of NO2- and NO3- are -34.6 kJ mol-1 and -110.5 kJ mol-1, respectively, Calculate the amount of Gibbs energy released when 1 mole of NO2- is oxidized to 1 mole of NO3-.
For CaF2(s) ⇋ Ca2+(aq) + 2 F−(aq), K = 3.9 ×10−11 at 25 °C and the standard Gibbs energy of formation of CaF2(s) is −1167 kJ mol−1. Calculate the standard Gibbs energy of formation of CaF2(aq).
For the reaction N2 (g) + 3H2(g) --> 2 NH3 (g), (a) what is the reaction Gibbs free energy at equilibrium? ....... J/mol The equilibrium constant of the reaction N2 (g) + 3H2(g) --> 2 NH3 (g) at 68 oC is Keq = 401,568. (b) What is the standard reaction Gibbs energy of this reaction?.....J/mol
Calculate (a) the standard reaction entropy and (b) the change in entropyof the surroundings (at 298 K) of the reaction N2(g) + 3 H2(g) → 2 NH3(g). (c) Hence calculate the standard Gibbs energy of the reaction.
The standard Gibbs energy of formation of PH3 (g) is 13.4 kJ/mol at 298 K. What is the corresponding reaction Gibbs energy when the partial pressures of the H2 and PH3(treated as perfect gases) are 1.0 bar and 0.60 bar, respectively? What is the spontaneous direction of the reaction in this case?