CHM142 Final Exam Review with correct solutions 2024/2025 University of Miami
The standard reduction potential for the half-reaction HClO(aq) + H+(aq) + e- → ½Cl2(g) + H2O(l) is 1.61 V. What is the standard reduction potential for the following half-reaction? 2HClO(aq) + 2H+(aq) + 2e- → Cl2(g) + 2H2O(l) - Ans: 1.61 V Given that Eºcell = 0.60 V for a voltaic cell in which the following redox reaction takes place 2Rh(s) + 3Cl2(g) → 2Rh3+(aq) + 6Cl-(aq) and that the standard reduction potential for the half-reaction Cl2(g) + 2e- → 2Cl-(aq) is 1.36 V, calculate the standard reduction potential for the half-reaction Rh3+(aq) + 3e- → Rh(s). - Ans: 0.76 V A voltaic cell operating under standard conditions is based on the two half-reactions given below. Which half-reaction will occur at the anode of this voltaic cells? What is the molality (in mol/kg) of a solution of methanol (CH3OH) in water which contains 16.5% of methanol by mass. The density of this solution is 0.9716 g/mL - Ans: 6.17 m Calculate the lowest theoretically possible freezing point for a solution made from 3.46 g FeCl3 (molar mass - 162.20 g/mol) and 11.62 g of water. Kf(H2O) = 1.86 C/m. Tf(H2O) = 0.0oC. - Ans: -13.7 ℃ A solution containing 0.894 g of an unknown substance in 33.2 mL of aqueous solution has an osmotic pressure of 1.46 atm at 22 oC. What is the molar mass (in g/mol) of the unknown substance? - Ans: 447 Consider the following reaction 4NH3(g) + 7O2(g) -> 4NO2(g) + 6H2O(g) Which one of the following is not a valid expression between various rates involving reactants and products?
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