John uses a balance to determine the mass of a rock is 6.5 grams. A graduated bottle contains 10.0 milliliters of water. When the rock is carefully lowered into the graduated bottle and is completely covered with water the volume of the water containing the marble has increased to 12.2 milliliters. Find the density of the rock. (round to the nearest tenth if necessary)

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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.

Answer:   d.  carbon dioxide.