Homework 10-solutions - urrutia(cu765 Homework 10 sutclie(51060 1 This print-out should have 20 questions Multiple-choice questions may continue on the

Homework 10-solutions - urrutia(cu765 Homework 10...

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urrutia (cu765) – Homework 10 – sutcliffe – (51060) 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 you should be sure to INCLUDE the 1/a term for species A when determining the rate. 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 F] 2 Δ t correct 2. - 2 Δ[NO 2 ] Δ t 3. Δ[NO 2 F] Δ t 4. Δ[NO 2 ] 2 Δ t 5. - Δ[NO 2 ] Δ t Explanation: 002 10.0 points 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. the reaction represented by the upper curve 3. Unable to determine 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. 2 . 7 mol L · min 2. 1 . 8 mol L · min 3. 5 . 4 mol L · min correct 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 (part 2 of 2) 10.0 points What is the unique rate of the reaction? 1. 2 . 7 mol L · min
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urrutia (cu765) – Homework 10 – sutcliffe – (51060) 2 2. 5 . 4 mol L · min 3. 10 . 8 mol L · min 4. 1 . 8 mol L · min correct 5. 0 . 9 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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  • Spring '12
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  • Reaction, Chemical reaction, Rate equation, 0.111 M, 0.112 m

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