21. S is negative for the reaction ___ [A] Mg(NO 3 ) 2 (aq)+K 2 CO 3 (aq)MgCO 3

Question

21. S is negative for the reaction ___

   [A] Mg(NO3)2(aq)+K2CO3(aq)MgCO3(s)+2NaNO3(aq)

   [B] LiOH(aq)Li+(aq)+OH(aq)

   [C] C6H12O6(s)6C(s)+6H2(g)+3O2(g)

   [D] 2NH3(g)N2(g)+3H2(g)

   [E] CH3OH(l)CH3OH(g)

22. Of the following, the entropy of ________ is the largest

[A] HBr (g) [B] HCl (l) [C] HCl (g) [D] HCl (s) [E] HI (g)

23. S is positive for the reaction ________

[A] 2Hg (l) + O2 (g) 2HgO (s) [B] BaF2 (s) Ba2+ (aq) + 2F- (aq)

[C] 2H2 (g) + O2 (g) 2H2O (g) [D] 2NO2 (g) N2O4 (g)

[E] CO2 (g) CO2 (s)

24. Calculate G° (in kJ/mol) for the following reaction at 1 atm and 25 °C:

   2C2H6 (g) + 7O2 (g) 4CO2 (g) + 6H2O (l)

Gf° C2H6 (g) = -32.89 kJ/mol; Gf°CO2 (g) = -394.4 kJ/mol; Gf° H2O (l) = -237.13

   kJ/mol, and Gf°O2 (g) = 0

[A] -2934.6 [B] -3033.27 [C] -441.37 [D] +441.37 [E] +2934.6

Explanation / Answer

answers :

21 )    [A] Mg(NO3)2(aq)+K2CO3(aq)MgCO3(s)+2NaNO3(aq)

22) [E] HI (g)

HI molar mass is more and which is in gaseous state so more entropy

23 )    [B] BaF2 (s) Ba2+ (aq) + 2F- (aq)

24 ) answer:   [A] -2934.6   

G = ( 4 x -394.4 + 6 x -237.13 ) - ( 2 x -32.89 + 7 x 0)

= -2934.6 kJ /mol

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