
Choices:
a) -1.19 V
b) -0.91 V
c) -0.63 V
d) 0.63 V
e) 0.91 V
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A voltaic cell consists of two half-cells. One half-cell contains a chromium electrode immersed in 1.00 M Cr(NO3)3 solution. The second half-cell contains a cobalt electrode immersed in 1.00 M Co(NO3)2 solution. Cobalt plates out on the cobalt electrode as the voltaic cell runs. The beginning voltage of the cell is +0.467 V at 25°C. The standard electrode potential (standard reduction potential) of chromium at 25°C is −0.744 V. (a) Write a balanced half-reaction equation for the reaction occurring at...
C)/-1.78 V )-0.89 V Given that the is the standard E) None of these. 24,Forthe reaction N产(aq) + 2Fe2+(aq) → Ni(s) A) 0.80 V 2Fe3 (aq), the standard cell potential cell is oneduo -0.30 v B 0.30 V 9.チ A) +2.81 V +0.52 V D-1.02 V. D) -0.80 V E) 0.43 V 29. Which one E) -2.81 V. spontaneous 25. Consider an electrochemical cell based on the C? following cell diagram:
Consider a galvanic electrochemical cell constructed using Cr/Cr3* and Zn/Zn2+ at 25 °C. The following half-reactions are provided for each metal: Cr3+ (aq) + 3 e → Cr(s) Eºred = -0.744 V Zna*(aq) + 2 e Zn(s) Eºred = -0.763 V What is the standard cell potential for this cell?
86. What is the formula for lead (IV) sulfide? B) PbS A) PbS C) Pb S D) Pb,S E) Pb,S 87. What is the name of H3PO4? A) hydrochloric acid C) sulfuric acid D) phosphoric acid E) none of these B) nitric acid 88. What is the name of Co,O,? A) dicobalt trioxide cobalt (II) oxide D) cobalt (III) oxide B) cobalt trioxide C) E) dicobalt (I) trioxide 89. What is the name of H2SO4 A) hydrosulfuric acid C) sulfuric...
Given: C+++ (aq) +3e" = Cr(s);E°=-0.74V Ag+ (aq) +e Ag(s); E° = 0.80 V What is the cell potential at 25°C for the following cell? Cr(s) | Cr3+(0.010 M) || Ag+(0.00025 M) | Ag(s) a) 1.71 V b) 1.51 V O c) 0.95 V d) 2.09 V e) 1.37 V
Consider a galvanic electrochemical cell constructed using Cr/Cr³⁺ and Zn/Zn²⁺ at 25 °C. The following half-reactions are provided for each metal: Cr³⁺(aq) + 3 e⁻ → Cr(s) E°red = -0.744 V Zn²⁺(aq) + 2 e⁻ → Zn(s) E°red = -0.763 V which half reaction takes place at the anode which is the standar cell potential write the balance equation for the overall reaction in acidic sol What is the cell potential for this cell at 25 °C when [Zn²⁺] =...
Given the following half-cell potentials, i. Zn2+ + 2 e– → Zn (E° = –0.76 V) ii. Cr3+ + 3 e– → Cr (E° = –0.74 V) determine the cell potential whose overall redox reaction under standard conditions is 3 Zn(s) + 2 Cr3+(aq) → 3 Zn2+(aq) + 2 Cr(s): * A. –0.80 V B. –0.02 V C. +0.02 V D. +0.80 V
Using the standard electrode potentials Co2+(aq) + 2e → Co(s) E° = -0.28 V Fe2+(aq) + 2e → Fe(s) E° = -0.44 V choose the correct statement. Cobalt protects iron against corrosion by forming an insulating layer of oxide. Cobalt will protect iron against corrosion by cathodic protection. Cobalt is easier to oxidize than iron. Cobalt will be used as a sacrificial anode to protect iron against corrosion. Cobalt will serve as the cathode in an electrochemical cell when in...
Page 3 An electrochemical is prepared from a chromium metal electrode in contact solution of 0.500 M chromium (III) nitrate and a standard hydrogen half-cell elect The two half cells are connected by a porous disk or a KCl salt bridge. Standard Reduction Potentials at 298 K Cr+ (aq) + 3e ----> Cr(s) Cr+ (aq) + e ----> Cr2+ (aq) E° = -0.740 V E° = -0.440 V a) Write the reaction for the cell and calculate the standard free...
how is cell potential become 1.51 - 1.19?? for
question b.
it was originally 1.51 / 1.19 both positive.
then reversed second reaction (anode)
shouldn't it be 1.51 - (-1.19) so 2.7..?
8.3 Standard Reduction Po Also, since the two half-reactions invo anust be multiplied by integers as foilows lve different numhers of electrons 3(Mg--> Mg2+ + 2e-) %" (cathode)--1.66 V 2.37 V 2A13+ (aq) + 3Mg(s)-→ 2Al(s) + 3Mgat (aq) go (anode) l(cathode) (anode -1.66 V + 2.37 V...