25. Assume the reaction below is initially at equilibrium. UO₂(s) + 4 HF(g) UF4(g) + 2 H₂O(g) a. Complete the following table. Indicate whether the concentrations of HF UF4, and H₂O and the value of Ke increase (I), decrease (D), or remain the same (S). Also indicate the direction of the shift (use an arrow) for each change described. Assume the reaction is exothermic. [HF] Change Add UO2 Remove UO2 Decrease T Decrease V Increase P [UF4] [H₂O] b Write the equilibrium expression, Ke, for the reaction above. Ke Shift (S,, or )

25. Assume the reaction below is initially at equilibrium. UO₂(s) + 4 HF(g) UF4(g) + 2 H₂O(g) a. Complete the following table. Indicate whether the concentrations of HF UF4, and H₂O and the value of Ke increase (I), decrease (D), or remain the same (S). Also indicate the direction of the shift (use an arrow) for each change described. Assume the reaction is exothermic. [HF] Change Add UO2 Remove UO2 Decrease T Decrease V Increase P [UF4] [H₂O] b Write the equilibrium expression, Ke, for the reaction above. Ke Shift (S,, or )

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter13: Chemical Equilibrium

Section: Chapter Questions

Problem 23Q: Consider the reaction 2N2O(g) + O2(g) 4NO(g) Suppose the system is at equilibrium, and then an...

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Consider the reaction 2N2O(g) + O2(g) 4NO(g) Suppose the system is at equilibrium, and then an additional mole of N2O(g) is injected into the system at constant temperature. Once the reaction reestablishes equilibrium, has the amount of N2O increased or decreased from its original equilibrium amount? Explain. What happens to the value of the equilibrium constant with this change?
The equilibrium constant for the reaction N2(g) + O2(g) 2 NO(g) is 1.7 103 at 2300 K. (a) What is K for the reaction when written as follows? N2(g) + O2(g) NO(g) (b) What is K for the following reaction? 2 NO(g) N2(g) + O2(g)
A cave in Mexico was recently discovered to have some interesting chemistry. Hydrogen sulfide, H2S, reacts with oxygen in the cave to give sulfuric acid, which drips from the ceiling in droplets with a pH less than 1. The reaction occurring is H2S(g) + 2 O2(g) H2SO4() Calculate rH, rS, and rG. Is the reaction product-favored at equilibrium at 25 C? Is it enthalpy- or entropy-driven?
Wet limestone is used to scrub SO2 gas from the exhaust gases of power plants. One possible reaction gives hydrated calcium sulfite: CaCO3(s) + SO2(g) + H2O() CaSO3 H2O(s) + CO2(g) Another reaction gives hydrated calcium sulfate: CaCO3(s) + SO2(g) + H2O() + O2(g) CaSO4 H2O(s) + CO2(g) (a) Which reaction is more product-favored at equilibrium? Use the data in the table below and any other information needed in Appendix L to calculate rG for each reaction at 25 C. (b) Calculate rG for the reaction CaSO3 H2O(s) + O2(g) CaSO4 H2O(s) Is this reaction product- or reactant-favored at equilibrium?
12.108 A nuclear engineer is considering the effect of discharging waste heat from a power plant into a lake and estimates that this may warm the water locally to 25 °C. One question to be considered is the effect of this temperature change on the uptake of CO2 by the water. The equilibrium constant for the reaction CO2+H2OH2CO3 ; is K=1.7103 at 25 °C. Because bonds form, the reaction is exothermic. (a) Will this reaction progress further toward products at higher temperatures near the water discharge with its warmer water than it would in the cooler lake water? Explain your reasoning. (b) Carbonic acid has a Kaof 2.5104 at 25 °C. What is the equilibrium constant for the CO2+2H2OHCO3+H3O+? (c) What additional factor should the engineer be considering about CO2 gas, probably before considering this reaction chemistry?
. Calcium sulfate, CaSO4, is only soluble in water to the extent of approximately 2.05 g/L at 25 °C. Calculate Kspfor calcium sulfate at 25°C.
. Plants synthesize the sugar dextrose according to the following reaction by absorbing radiant energy from the sun (photosynthesis). 6CO2(g)+6H2O(g)C6H12O6(g)+6O2(g)Will an increase in temperature tend to favor or discourage the production of C6H12O6(s)?
Consider the system 4 NH3(g) + 3 O2(g) ⇌ 2 N2(g) + 6 H20(ℓ) ΔrH° = −1530.4 kJ/mol How will the amount of ammonia at equilibrium be affected by removing O2(g) without changing the total gas volume? adding N2(g) without changing the total gas volume? adding water without changing the total gas volume? expanding the container? increasing the temperature? Which of these changes (i to v) increases the value of K? Which decreases it?
The creation of shells by mollusk species is a fascinating process. By utilizing the Ca2+ in their food and aqueous environment, as well as some complex equilibrium processes, a hard calcium carbonate shell can be produced. One important equilibrium reaction in this complex process is HCO3(aq)H+(aq)+CO32(aq)K=5.61011 If 0.16 mole of HCO3 is placed into 1.00 L of solution, what will be the equilibrium concentration of CO32?
Analysis of the gases in a sealed reaction vessel containing NH3, N2, and H2 at equilibrium at 400 C established the concentration of N2 to be 1.2 M and the concentration of H2 to be 0.24 M. N2(g)+3H2(g)2NH3(g)Kc=0.50 at 400 C Calculate the equilibrium molar concentration of NH3.