Question

29. A process has a AH° of 8.5 kJ/mol and a AS™ of 35.2 J/mol-K. What is AGº at 300 K for this process? A) -23.0 kJ/mol B) -2.06 kJ/mol C) +33.4 kJ/mol D) +1.24 kJ/mol cd2 (aq) + 2e Sn2 30. A spontaneous voltaic cell is based on the following two standard half-reactions: (aq) + 2e Cd (w) Eº red (Ca/Cd) = -0.40 V → Sn) Ered (Sn/Sn) = -0.14 V What is the standard cell potential, Ecell? A) -0.26 V B) +0.54 V C) -0.54 V D) +0.26 V 31. Do you expect the viscosity of glycerol, (a) C3H5(OH)3, to be larger or smaller than that of (b)l-propanol, C3H-OH, and why? (a) Glycerol (b) 1-Propanol A) Smaller, due to London dispersion forces between the glycerol molecules B) Larger, due to the hydrogen bonding involving the three OH groups of glycerol C) No difference in viscosity between the two molecules D) Larger, due to ion-dipole interactions

Answer 1

( 31) Viscosity is the resistance of a substance to flow ,it depends on also the intermolecular force .In glycerol there is presence of 3 OH group which form Hydrogen bond where as in 1-propanol there is only one OH .So Glycerol is larger viscous than the 1-propanol

(292 Given 4H = = 8.5x103 Ilmal 8.5 kJ/mol 35.2 J/mol. K 45 T 300K o We know, AG AH TAS all values, we get putting 46 = 8.5x10²5/mol 300 K x 35.2 J/mol. * 2060 J/mol 4G - 2.06 kJ/mol option (B) (30 -0.90 V At anode, cdo comat ge- (oxidation ) at cathode, sm?faq) + 3€ shfaq) + 3€ → sn (s) -0.19v 2+. cd (s) + sh (aq) 2+ → cd + Sn (s) . E cell E cathode- & anode [0.14 - 60.90)] v 0.26 v option (0) Ecell CS Scanned with CamScanner

So opinion (B) is the correct option