Table 20.2 Half-reaction C()3-0.74 Fe2+ (ag) 2eFe(s) 0440 Fe3+ (ag)Fe2 () 0.771
ID: 304545 • Letter: T
Question
Table 20.2 Half-reaction C()3-0.74 Fe2+ (ag) 2eFe(s) 0440 Fe3+ (ag)Fe2 () 0.771 Sn4+ (aq) + 2e-? Sn2+ (aq) 1 +0.154 12. Using Table 20.2 above select the reaction that will occur spontaneously as written? a. 3Fe (aq) >Fe(s)+2Fe (aq) b. Sn"(aq) + Fe"(aq) ?Sn2+(aq) + Fe"(aq) d. 3Sn (aq)+ 2Cr(s)->2Cr (a)+3Sn2 (aq) e. Sn"(aq) +Fe"(aq) ? Sn2+(aq) + Fe(s) 13. The standard cell potential (E ell) of the reaction below is +0.126 V. The value of AGo f reaction is kJ/mol. Pb (s)+2H' (aq) ->Pb2 (aq)+H2(g) a. +24.3 b. -24.3 c. -12.6 d. +12.6 e. -50.8Explanation / Answer
Option (D) is correct.
As standard reduction potential E° of Sn is higher than Cr so it get reduced.
13.
?G° = -nFE°
= - 2×96500×0.126
= -24.3 kJ/mol
(b) is correct option.
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