Gold is alloyed(mixed) with other metals to increase its hardness in making jewelry. (a) consider a piece of gold jewelry that weighs 9.85 g and has a volume of 0.675 cm3. the jewelry contains only gold and silver, which have densities of 19.3 g/cm3 and 10.5 g/cm3, repectively. if the total volume of the jewelry is the sum of the volumes of the gold and silver that it contains. calculate the percentage of gold(by mass) in the jewelry. (b) the relative amount of gold in an alloy is commonly expressed in units of karats.

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.