± Reaction Rates To measure the speed of a car, we use miles per hour (miles/hou

Question

± Reaction Rates

To measure the speed of a car, we use miles per hour (miles/hour or mi/h or mph). To measure the rate of a reaction we use molar concentration per second(M/s).

Part A

Express your answer to three significant figures and include the appropriate units. Use mi as an abbreviation for miles, and h for hours, or mph can be used to indicate miles per hour.

48.2 mph

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H2+2ICl2HCl+I2

Part B

What is the average rate of formation of I2?

Express your answer to three decimal places and include the appropriate units.

0.021 Ms

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Part C

Based on your answer to Part B, what is the average rate of formation of HCl?

Express your answer to three decimal places and include the appropriate units.

0.042 Ms

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According to the chemical equation, there will be twice as many moles of HCl formed as moles of I2. Therefore, the molar concentration of HCl is increasing at twice the rate of the I2 concentration.

Part D

Based on your answer to Part B or C, what is the average rate of change of H2? Remember that reactant concentrations decrease over time.

Express your answer to three decimal places and include the appropriate units.

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± Reaction Rates

To measure the speed of a car, we use miles per hour (miles/hour or mi/h or mph). To measure the rate of a reaction we use molar concentration per second(M/s).

Part A

Imagine that you took a road trip. Based on the information in the table, what was the average speed of your car? Time Mile marker 3:00 pm 28 8:00 pm 269

Express your answer to three significant figures and include the appropriate units. Use mi as an abbreviation for miles, and h for hours, or mph can be used to indicate miles per hour.

48.2 mph

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Now consider the following reaction and data:

H2+2ICl2HCl+I2

Time
(s) I2concentration
(M) 5 1.46 15 1.67

Part B

What is the average rate of formation of I2?

Express your answer to three decimal places and include the appropriate units.

0.021 Ms

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Part C

Based on your answer to Part B, what is the average rate of formation of HCl?

Express your answer to three decimal places and include the appropriate units.

0.042 Ms

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According to the chemical equation, there will be twice as many moles of HCl formed as moles of I2. Therefore, the molar concentration of HCl is increasing at twice the rate of the I2 concentration.

Part D

Based on your answer to Part B or C, what is the average rate of change of H2? Remember that reactant concentrations decrease over time.

Express your answer to three decimal places and include the appropriate units.

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Explanation / Answer

Part A

(269 - 28) = 241 miles
241 miles/ 5 hours = 48.1 miles per hour

Part B)

Average rate = (1.67 - 1.46) / (15 - 5) = 0.021M/s

Part C)

Time(s) . . . . . . . . .I2 (M). . . . . . . . . . . . 2 HCl (M)

. . 5 s . . . . . . . . . .1.46 . . . . . . . . . . . (2 x 1.46) = 2.92 M
. .15 s . . . . . . . . . 1.67. . . . . . . . . . . (2 x 1.67) = 3.34 M


Average rate = C(HCl) / t
Average rate = (3.34 - 2.92) / (15 - 5) = 0.42M/s

Part D)

reactant concentrations will decrease over the time

Time(s) . . . . . . . . .I2 (M). . . . . . . . . .H2 (M)

. . 5 s . . . . . . . . . .1.46 . . . . . . . . . . - 1.46 M
. .15 s . . . . . . . . . 1.67 . . . . . . . . . . - 1.67 M


Average rate = C(H2) / t

Average rate = (- 1.67 - (-1.46)) / (15 - 5) = - 0.021 M/s

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