If we start with 1 msolutions of both zn2 and cu2 ions at 25 °c, the following oxidation-reduction reaction has a potential of 1.10 v. zn(s) cu2 (aq) →zn2 (aq) cu(s)predict what would happen to the voltageof a batterybased on this reaction as the zinc metal is graduallyoxidized and the cu2 ions are graduallyreduced. use this prediction to explain whya battery-driven watch stops suddenly.

)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.