Which of the following represents the number of moles of a solute in one liter of a solution?

1. density
2. molarity
3. percent by mass
4. volume

question 2

the ph of a solution is 2.60. what is the [h3o+] for the solution?

1. 2.51 × 102 m
2. 3.98 × 102 m
3. 2.51 × 10−3 m
4. 3.98 × 10−3 m

Q1: 2. Molarity.

Q2: 2.51 x 10⁻³.

Explanation:

Q1:

The molarity is defined as the no. of moles of solute in  one liter of solution.It is can be calculated from the relation: M = (no. of moles of solute)/(Volume in L of the solution).

Q2:

∵ pH = - log[H₃O⁺]

∴ 2.60 = - log[H₃O⁺]

log[H₃O⁺] = -2.6.

∴ [H₃O⁺] = 2.51 x 10⁻³.

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.