{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Suggest Prob 8_Solutions

# Suggest Prob 8_Solutions - kapur(rk7259 Suggested Problems...

This preview shows pages 1–3. Sign up to view the full content.

kapur (rk7259) – Suggested Problems 8 – rowland – (53210) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The rate of formation of NO 2 (g) in the reac- tion 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) is 5 . 78 (mol NO 2 ) / L / s. What is the rate at which N 2 O 5 decomposes? 1. 2 . 89 (mol N 2 O 5 ) / L / s correct 2. 1 . 45 (mol N 2 O 5 ) / L / s 3. 11 . 6 (mol N 2 O 5 ) / L / s 4. 5 . 78 (mol N 2 O 5 ) / L / s 5. 0 . 723 (mol N 2 O 5 ) / L / s Explanation: 002 10.0 points Consider the concentration-time dependence graph for a first-order reaction. [A] 0 Molar Concentration of Reactant A B C Concentration -→ Time -→ At which point on the curve is the reaction fastest? 1. A + t 1 / 2 2. A correct 3. C 4. B 5. The rates are the same at all points. Explanation: Steeper portions of the graph define faster reactions. 003 10.0 points Consider the concentration-time dependence as shown below for two first order reactions. [A] 0 Molar Concentration of Reactant Concentration -→ Time -→ Which reaction has the greatest t 1 / 2 ? 1. the reaction represented by the lower curve 2. the reaction represented by the upper curve correct 3. Unable to determine Explanation: 004 10.0 points 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[SO 3 ] 2 · Δ t 2. - 4 · Δ[S 8 ] Δ t

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
kapur (rk7259) – Suggested Problems 8 – rowland – (53210) 2 3. 2 · Δ[SO 3 ] Δ t 4. - Δ[O 2 ] 3 · Δ t correct 5. Δ[O 2 ] 3 · Δ t Explanation: rate = - Δ[O 2 ] 3 · Δ t = Δ[SO 3 ] 2 · Δ t 005 10.0 points Based on the plot below, what are the units of the rate constant for this reaction? [A] (M) time (min) 1. s 1 2. M 1 · s 1 3. M · min 1 correct 4. M 1 · min 1 Explanation: The y-axis is presented in units of concen- tration. This, together with the fact that the line has a constant slope, tells us that this is a zero order process. The x-axis tells us the time unit is minutes. 006 10.0 points Under certain conditions, the reaction 3 A + 4 B 5 C is observed to proceed at a rate of 0 . 017 M · s 1 . What is the corresponding rate of change in product C? 1. 0 . 00566667 M · s 1 2. - 0 . 085 M · s 1 3. 0 . 017 M · s 1 4. 0 . 051 M · s 1 5. - 0 . 017 M · s 1 6. 0 . 0034 M · s 1 7. - 0 . 00566667 M · s 1 8. - 0 . 051 M · s 1 9. - 0 . 0034 M · s 1 10. 0 . 085 M · s 1 correct Explanation: The given overall rate is positive which cor- responds to a forward direction as written. Product C is reacting at 5 times the stated rate of the overall reaction. C is also a prod- uct, so the concentration is INCREASING with time, which corresponds to a POSITIVE rate.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 8

Suggest Prob 8_Solutions - kapur(rk7259 Suggested Problems...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online