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Homework 10-solutions - phan(dtp377 Homework 10...

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phan (dtp377) – Homework 10 – sutcliffe – (51045) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points NOTE In this question you must consider the 1/a term mentioned in class. Consider the reaction below. Which of the following is a correct expression of the rate? 1 2 S 8 ( s ) + 3 O 2 ( g ) -→ 2 SO 3 ( g ) 1. - Δ[O 2 ] 3 · Δ t correct 2. Δ[O 2 ] 3 · Δ t 3. 2 · Δ[SO 3 ] Δ t 4. - 4 · Δ[S 8 ] Δ t 5. - Δ[SO 3 ] 2 · Δ t Explanation: rate = - Δ[O 2 ] 3 · Δ t = Δ[SO 3 ] 2 · Δ t 002 10.0points Consider the concentration-time dependence graph for two first-order reactions. [A] 0 Molar Concentration of Reactant Concentration -→ Time -→ Which reaction has the larger rate con- stant? 1. the reaction represented by the lower curve correct 2. Unable to determine 3. the reaction represented by the upper curve Explanation: 003(part1of2)10.0points For BOTH the next questions you MUST consider the 1/a term in the rate equation for species A, etc. A ”unique rate” means ’average rate’ taking into account the stoi- chiometric coefficients. In the reaction 3 ClO (aq) 2 Cl (aq) + ClO 3 (aq) the rate of reaction of Cl is 3 . 6 mol L · min . What is the rate of reaction of ClO ? 1. 1 . 8 mol L · min 2. 5 . 4 mol L · min correct 3. 2 . 7 mol L · min 4. 10 . 8 mol L · min 5. 0 . 9 mol L · min Explanation: rate of change of [ClO ] = parenleftbigg 3 . 6 mol Cl L · min parenrightbiggparenleftbigg 3 mol ClO 2 mol Cl parenrightbigg = 5 . 4 mol L · min 004(part2of2)10.0points What is the unique rate of the reaction? 1. 0 . 9 mol L · min 2. 5 . 4 mol L · min
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phan (dtp377) – Homework 10 – sutcliffe – (51045) 2 3. 10 . 8 mol L · min 4. 1 . 8 mol L · min correct 5. 2 . 7 mol L · min Explanation: The unique rate is given by rate of change g species coefficient g species For this reaction the unique rate is 1 2 × parenleftbigg 3 . 6 mol L · min parenrightbigg = 1 . 8 mol L · min 005 10.0points If the rate of reaction increases by a factor of 2.3 when the concentration of reactant in- creases by a factor of 1.5, what is the order of the reaction with respect to this reactant? 1. 1.5 2. 3 3. 4 4. 1 5. 2 correct Explanation: 006 10.0points Consider the rate constants below. Which would correspond to the highest order reac- tion?
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