CH302 Homework 10-solutions

CH302 Homework 10-solutions - Bodet (ngb299) Homework 10...

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Bodet (ngb299) – Homework 10 – sutclife – (51630) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. This is the LAST homework!! 001 10.0 points NOTE In this question you must consider the 1/a term mentioned in class. Consider the reaction below. Which o± the ±ollowing is a correct expression o± the rate? 1 2 S 8 ( s )+3O 2 ( g ) -→ 2SO 3 ( g ) 1. - Δ[O 2 ] 3 · Δ t correct 2. 2 · Δ[SO 3 ] Δ t 3. - 4 · Δ[S 8 ] Δ t 4. - Δ[SO 3 ] 2 · Δ t 5. Δ[O 2 ] 3 · Δ t Explanation: rate = - Δ[O 2 ] 3 · Δ t = Δ[SO 3 ] 2 · Δ t 002 10.0 points Consider the concentration-time dependence graph ±or two Frst-order reactions. [A] 0 Molar Concentration o± 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 (part 1 of 2) 10.0 points ²or BOTH the next questions you MUST consider the 1/a term in the rate equation ±or species A, etc. A ”unique rate” means ’average rate’ taking into account the stoi- chiometric coe³cients. In the reaction 3ClO - (aq) 2C l - (aq) + ClO - 3 (aq) the rate o± reaction o± Cl - is 3 . 6 mol L · min . What is the rate o± reaction o± ClO - ? 1. 2 . 7 mol L · min 2. 5 . 4 mol L · min correct 3. 0 . 9 mol L · min 4. 10 . 8 mol L · min 5. 1 . 8 mol L · min Explanation: rate o± change o± [ClO - ] = ± 3 . 6molCl - L · min ²± 3mo lC lO - 2molCl - ² =5 . 4 mol L · min 004 (part 2 of 2) 10.0 points What is the unique rate o± the reaction? 1. 2 . 7 mol L · min 2. 10 . 8 mol L · min
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Bodet (ngb299) – Homework 10 – sutclife – (51630) 2 3. 5 . 4 mol L · min 4. 0 . 9 mol L · min 5. 1 . 8 mol L · min correct Explanation: The unique rate is given by rate oF change g species coe±cient g species ²or this reaction the unique rate is 1 2 × ± 3 . 6 mol L · min ² =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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CH302 Homework 10-solutions - Bodet (ngb299) Homework 10...

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