hw10solution_pdf

hw10solution_pdf - So(dds785 – Homework 10 – Sutcliffe...

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Unformatted text preview: So (dds785) – Homework 10 – Sutcliffe – (52440) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is the LAST homework!! 001 10.0 points NOTE: In this question the equation is assum- ing you INCLUDE the 1/a term for species A. Consider the reaction 2 NO 2 (g) + F 2 (g) → 2 NO 2 F(g) rate =- Δ[F 2 ] Δ t . What is another form of the rate of the reaction? 1.- Δ[NO 2 ] Δ t 2.- 2 Δ[NO 2 ] Δ t 3. Δ[NO 2 F] Δ t 4. Δ[NO 2 F] 2 Δ t correct 5. Δ[NO 2 ] 2 Δ t Explanation: 002 10.0 points Consider the concentration-time dependence graph for two first-order reactions. [A] Molar Concentration of Reactant Concentration-→ Time-→ Which reaction has the larger rate con- stant? 1. the reaction represented by the upper curve 2. Unable to determine 3. the reaction represented by the lower curve correct Explanation: 003 (part 1 of 2) 10.0 points 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. 5 . 4 mol L · min correct 2. 10 . 8 mol L · min 3. . 9 mol L · min 4. 2 . 7 mol L · min 5. 1 . 8 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 (part 2 of 2) 10.0 points What is the unique rate of the reaction? 1. 2 . 7 mol L · min So (dds785) – Homework 10 – Sutcliffe – (52440) 2 2. . 9 mol L · min 3. 1 . 8 mol L · min correct 4. 5 . 4 mol L · min 5. 10 . 8 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 10.0 points 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?...
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This note was uploaded on 10/25/2010 for the course CH 302 taught by Professor Holcombe during the Fall '07 term at University of Texas.

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hw10solution_pdf - So(dds785 – Homework 10 – Sutcliffe...

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