Which of the following statements is TRUE? An exothermic process will always be

Question

Which of the following statements is TRUE? An exothermic process will always be spontaneous. a. A process in which the entropy of the system increases will always be spontaneous. b. An endothermic process can never be spontaneous. c. A process in which the entropy of the surroundings increases will always be spontaneous. d. An exothermic process that is accompanied by an increase in the entropy of the system will always be spontaneous. Which of the following processes will result in a INCREASE in the entropy of the system? All systems are closed systems. H_2O(g) rightarrow H_2O(I) a. Zn^2 (aq) + 4 NH_3(aq) rightarrow Zn(NH_3)_4^2+ (aq) b. O_2(g) (373 K) rightarrow O_2(g) (298 K) c. Zn^2+ (aq) + S^2- (aq) rightarrow ZnS(s) d. NH_3(g) (3 atm, 298 K) rightarrow NH_3(g) (I atm, 298 K) Methylene chloride, CH_2Cl_2 is a common organic solvent. Consider the following process at 25 degree C, in a closed system: CH_3CL_2(I) rightarrow CH_2CI_2(g) This process is endothermic (Delta H degree + 29.0 kJ). Which of the following statements is most likely TRUE regarding the spontaneity of this process at 25 degree C? The Process will be spontaneous because Delta S is negative. a. The process will be spontaneous because Delta S is positive. b. The process will be spontaneous if the boiling point of CH_2CI_2 is less than 25 degree C. c. The process will be spontaneous if the freezing point of CH_2CI_2 is greater than 25 degree C. d. The process will be spontaneous if the boiling point of CH_2CI_2 is greater than 25 degree C. Acetic acid, CH_3COOH, has an enthalpy of vaporization equal to 52.25 kJ and an entropy of vaporization equal to 122 I/K at its boiling point. Calculate the boiling point of acetic acid. 0.43 K a. 2.3 K b. 100 K c. 428 K d. 563 K Suppose we place 1.0 mole of the brown gas, NO_2 in a large glass cube at 25 degree C and I atm pressure. We then seal the tube, and wait for equilibrium to be established between NO_2 and the colorless species, N_2O_4. 2NO_2(g) Leftrightarrow N_2O_2(g)

Explanation / Answer

(p)

(d) An exothermic reaction which is accompaneid by increase in entropy will always be spontaneous.

Because for a reaction to be spontaneous, deltaG = deltaH - TdeltaS = - ve .

(q)

More is the disorderness more is the entropy.

(d) NH3 (3 atm, 298K) to NH3 (1atm, 298K)

Lower is the pressure molre is the disorderness and thus entropy.

(r)

(s)

entropy of vaporization = enthalpy of vaporization / boiling point

0.122 = 52.25 / T

T = 428 K

(C)

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