14. Which of the following is true for pure solids and liquids found in equilibr

Question

14. Which of the following is true for pure solids and liquids found in equilibrium A. Concentrations are set to l B. Concentrations are set to 0 C. They have constant concentration values. C. or C. D. Concentrations calculated using molar mass and volume E. Concentrations are equal to ionic charge 1S. Which of the following processes will lead to a positive entropy change in the system? A. Sodium chloride crystals form as water evaporates B. Helium gas escapes from a hole in a balloon C. Water freezes in a freezer D. Stalactites form in a cave E. None of the above 16. A proposed mechanism for the decomposition of ozone in the found below Which species is the reactive intermediate? A. CKg) C. Clog) D. 0xg) E. There are no intermediates 17. Reactions are always spontaneous under what conditions? A AS 0, AH 0 C. AS>0, AH co

Explanation / Answer

14. Option A is correct, as pure solids and liquids are in equilibrium concentrations are set to 1. It is because solids and liquids do not affect the reactant amount at equilibrium.

15. Option B is correct answer. When helium gas escapes from a hole in a balloon, the degrees of freedom of helium molecules increases which results in increase in reaction entropy. Hence, the entropy change will be positive.

16. Here ClO (g) is the reactive intermediate.

17. Reactions are always spontaneous when dS > 0 and dH < 0. Change of entropy should be positive and the enthalpy change should be negative ( when a reaction is exothermic).

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