Calculate the potentials of the following cells and say whether the electrochemical reaction occurs spontaneously. Consider...

  

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Calculate the potentials of the following cells and say whether the electrochemical reaction occurs spontaneously. Consider standard conditions (T 25°C) and that the concentrations of the compounds are equal to their activities. a. Pt I Cr2+ (2.00x10-3 M), • Cr³+ (1.00×10-4 M) II Pb²+ (5.60x10-2 b. Hg I Hg2+ (2.00x10-2 M) II H+ (1.00×10-2 M), VO²+ (2.00x10-3 M), V3+ (3.00x10-2 M) 1 Pt M) I Pb c. Pt | Fe²+ (3.00x10-5 M), Fe³+ (4.00×10-² M) II Sn4+ (3.50x10-4 M), Sn²+ (5.50x10-² M) 1 Pt d. Bi I BO+ (0.040 M), H (0.200 M) III (0.100 M), Agl (sat.) I Ag Datos. E° (Cr³+ Cr²+) = -0.408 V E° (Pb²+ +Pb) = -0.126 V E° (Hg2+ →Hg) = +0.854 V E° (Fe³+ >Fe2+) = +0.771 V E° (Sn4+ Sn²+) = +0.154 V E° (BIO+Bi) = +0.320 V Calculate the potentials of the following cells and say whether the electrochemical reaction occurs spontaneously. Consider standard conditions (T 25°C) and that the concentrations of the compounds are equal to their activities. a. Pt I Cr2+ (2.00x10-3 M), • Cr³+ (1.00×10-4 M) II Pb²+ (5.60x10-2 b. Hg I Hg2+ (2.00x10-2 M) II H+ (1.00×10-2 M), VO²+ (2.00x10-3 M), V3+ (3.00x10-2 M) 1 Pt M) I Pb c. Pt | Fe²+ (3.00x10-5 M), Fe³+ (4.00×10-² M) II Sn4+ (3.50x10-4 M), Sn²+ (5.50x10-² M) 1 Pt d. Bi I BO+ (0.040 M), H (0.200 M) III (0.100 M), Agl (sat.) I Ag Datos. E° (Cr³+ Cr²+) = -0.408 V E° (Pb²+ +Pb) = -0.126 V E° (Hg2+ →Hg) = +0.854 V E° (Fe³+ >Fe2+) = +0.771 V E° (Sn4+ Sn²+) = +0.154 V E° (BIO+Bi) = +0.320 V