Exam4_Solutions_Alternative

# The solution now is 40 0 ml 20 0 ml 60 0 ml and since

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tion. The solution now is 40 . 0 mL + 20 . 0 mL = 60 . 0 mL and, since HClO 4 is a strong acid ( i.e. , it’s completely dissociated), it contains 0.00500 mol H + . [H + ] is then [H + ] = 0 . 00500 mol 0 . 0600 L = 0.0833 M which means that the pH of this solution is pH = log [H + ] = log (0.0833) = 1.08 024 10.0 points Consider the voltaic cell In | In 3+ (0 . 010 M) || Ru 3+ (1 . 0 M) , Ru 2+ (0 . 010 M) | C In 3+ + 3 e In E 0 = 0 . 34 V Ru 3+ + 1 e Ru 2+ E 0 = 0 . 08 V The electron flow in the external circuit is from 1. In 3+ to C. 2. In 3+ to Ru 2+ . 3. In to Ru 3+ . 4. In to C. correct 5. Ru 3+ to In. Explanation: 025 10.0 points NOTE: Below is a typo. Cross it out. The CORRECT sentence should read: For the reaction A + B X + Y For the reaction X + Y Z + R which arrow represents the activation energy of the forward reaction? e f c d a b A+B X+Y Reaction progress Potential energy 1. d 2. e 3. f 4. b correct 5. c 6. a Explanation: The activation energy is represented by the vertical line from the Δ H of the reactants to the apex of the curve.
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