40) Which has the highest entropy in each set? H2O(s), H2O H2O(g) at 0.1°C, 4.40

Question

40) Which has the highest entropy in each set? H2O(s), H2O H2O(g) at 0.1°C, 4.40 atm II. H200) at o°C, H20(0) at 23°C, H200D at 100°C (all at 1.0 atm pressure) A) H2O(g) in set I and H20(U) at 100°C in set II B) H20(s) in set I and H2O() at 100°C in set II C) H20?in set l and H2O(l) at 0°C in set 11 D) H20(g) in set I and H20(0) at 0°C in set II 33) 33) At high temperatures boron carbide vaporizes according to the equation B4C(s) 4 B(g)+ C(s) Which equation describes the relationship between ?G° and ?G for this reaction? C) AG-AG+R T In pB 35) Calculate ASo for the formation of three moles of solid sodium bromide from the elements at 35) 25°C. Species S J/(K mol) NaBr (s) Na(s) 868 512 B ( 152.2 A)-243.6 J/K B) -350.1 J/K C) 260.4 J/K D) -121.5 J/K 28) Which of the folowing processes is non-spontaneous at standard temperature and pressure? A) Melting of solid ice to ice water. B) Iron metal, oxygen, and water form rust (Fe203). C) Diffusion of perfume molecules across a room. D) A reaction at equilibrium moves to non-equilibrium

Explanation / Answer

40.

Entropy is the measure of disorderness. Higher is the disorderness higher is the entropy.

So,

(a) H2O (g) in set I and H2O (l) at 1000C in set II

33.

(D) deltaG = deltaG0 + 4 R Tln(PB)

35.

Na (s) + 1/2 Br2 (l) --------------> NaBr (s)

deltaS0r = deltaS0f(NaBr) - deltaS0f(Na) - (1/2) * deltaS0f(Br2) = 86.8 - 51.2 - (1/2)(152.2) = - 40.5 J/K.mol

For 3 mol of NaBr = - 40.5 * 3 = - 121.5 J/K.mol

(D)

28.

(D)

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