In which of the following processes is AH = AU? A. Two moles of ammonia gas are cooled from 325°C to 300°C at 1.2 atm. B. One gram of water is vaporized at 100°C and 1 atm. C. Two moles of hydrogen iodide gas react to form hydrogen gas and iodine gas in a 40-L container. D. Calcium carbonate is heated to form calcium oxide and carbon dioxide in a container with variable volume. E. One mole of solid carbon dioxide sublimes to the gas phase. B E

In which of the following processes is AH = AU? A. Two moles of ammonia gas are cooled from 325°C to 300°C at 1.2 atm. B. One gram of water is vaporized at 100°C and 1 atm. C. Two moles of hydrogen iodide gas react to form hydrogen gas and iodine gas in a 40-L container. D. Calcium carbonate is heated to form calcium oxide and carbon dioxide in a container with variable volume. E. One mole of solid carbon dioxide sublimes to the gas phase. B E

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Which of the following changes would result in an increase of nitrogen dioxide, NO2? N204(g) 2NO2 AH° = 58 kJ O Increasing pressure O Increasing volume O Decrease temperature Addition of He(g) • Previous Next»
In which of the following processes is AH = AU? Two moles of hydrogen iodide gas react to form hydrogen gas and iodine gas in a 40-L container. O Calcium carbonate is heated to form calcium oxide and carbon dioxide in a container with variable volume. One mole of solid carbon dioxide sublimes to the gas phase. O One gram of water is vaporized at 100°C and 1 atm. O Two moles of ammonia gas are cooled from 325°C to 300°C at 1.2 atm
The standard molar Gibbs free energy of formation for oxygen gas is: A. −15 kJ mol−1 B. 0 kJ mol−1 C. much larger than ΔfG° of hydrogen gas D. much less than ΔfG° of elemental uranium E. equal to ΔfG° of elemental tungsten F. Both C. and D. G. Both B. and E.
Consider the following system at equilibrium where AH° = -111 kJ, and K. = 0.159, at 723 K. N2(g) + 3H2(g) =2NH3(g) If the VOLUME of the equilibrium system is suddenly decreased at constant temperature: The value of K. A. increases. B. decreases. C. remains the same. The value of Q. A. is greater than K.. B. is equal to K.. C. is less than K.. The reaction must: A. run in the forward direction to reestablish equilibrium. B. run in the reverse direction to reestablish equilibrium. C. remain the same. It is already at equilibrium. The number of moles of H, will: A. increase. B. decrease. C. remain the same.