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  • Q1:Use standard reduction potentials to calculate the standard free energy change in kJ for the reaction: Hg²+ (aq) + Ni(s) → Hg(s) + Ni²+ (aq) 2+ Hg²+ (aq) + 2e¯ → Hg(s) Fred 0.855 V Ni2+ (aq) +2e → Ni(s) Ed=-0.250 V red = AG° = kJ K for this reaction would be = than one.See Answer
  • Q2:Calculate the diffusion overpotential for hydrogen formation, 2H+(aq) + 2e- = H2(g) at current density of 0.25 A/cm2 and temperature of 25 °C, if the limiting current is 1 A/cm2 A) -7.40 mV B) -0.31 mV C) -3.70 mV Points Earned: Correct Answer(s): C 4.0/4.0See Answer
  • Q3:A voltaic cell is constructed in which the anode is a Cr²+ | Cr³+ half cell and the cathode is a Fe²+ | Fe³+ half cell. The half-cell compartments are connected by a salt bridge. (Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.) The anode reaction is: + The cathode reaction is: + The net cell reaction is: + In the external circuit, electrons migrate | electrode. In the salt bridge, anions migrate compartment. + the Fe²+ | Fe³+ electrode ( the Cr²+ | Cr³+ compartment ( the Cr²+ | Cr³+ *|Fe3+ the Fe²+See Answer

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