An electrochemical cell is constructed such that on one side a pure Zn electrode is in contact with a solution containing Zn2+ ions at a concentration of 10–2 M. The other cell half consists of a pure Pb electrode immersed in a solution of Pb2+ ions that has a concentration of 10–4 M. At what temperature will the potential between the two electrodes be +0.568 V?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.