Suppose a Voltaic/Galvanic cell at 298 K runs on the reactio…

Suppose a Voltaic/Galvanic cell at 298 K runs on the reaction,  Sn(s) + Nr2+(aq)   à  Sn2+(aq) +   Nr(s), where Nr is a fake element with the reduction potential,    Nr2+(aq) + 2e- à Nr(s)         E°1/2 = 0.40 V.  The cell contains the following concentrations in each half cell: Sn(s) /Sn2+, [Sn(NO3)2] = 0.70 M               Nr(s)/Nr2+, [Nr(NO3)2] =  {M} M      What is the value of Ecell?            Answer format:  Enter the answer in Volts but do not include the units.  Enter 2 sig figs in standard, not scientific notation. 

A concentration cell consists of two Zn/Zn2+ electrodes. The…

A concentration cell consists of two Zn/Zn2+ electrodes. The electrolyte in side A is {M} M Zn(NO3)2 and in side B is 0.10 M Zn(NO3)2. What is the voltage of the cell at 25°C for this cell running spontaneously?  Answer format:  Enter the answer in standard, not scientific notation using 3 decimal places.  Do not include units.