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quiz5dvb - Version 206 Quiz 5 VANDEN BOUT(53585 This...

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Version 206 – Quiz 5 – VANDEN BOUT – (53585) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider the irreversible reaction A + 2 B 3 C . Which of the following correctly expresses the rate of change of [B] ? 1. Δ[B] Δ t = - 1 2 (rate of rxn) 2. Δ[B] Δ t = - 2 (rate of rxn) correct 3. Δ[B] Δ t = +(rate of rxn) 4. Δ[B] Δ t = - (rate of rxn) 5. Δ[B] Δ t = +2 (rate of rxn) 6. Δ[B] Δ t = + 1 2 (rate of rxn) Explanation: As B is a reactant and consequently disap- pears during the reaction, its rate of change will be negative and the inverse of the coeffi- cient is used when writing the rate: (rate of rxn) = - 1 2 Δ[B] Δ t - 2 (rate of rxn) = Δ[B] Δ t 002 10.0 points The reaction 2 N 2 O 5 2 N 2 O 4 + O 2 is first order. At a certain temperature it has a rate constant of 0.0840 sec 1 . At this temperature, how long would it take for 95% of a given sample to decompose?

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quiz5dvb - Version 206 Quiz 5 VANDEN BOUT(53585 This...

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