Question

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 AImagine that you took a road trip. Based on the information in the table, what was the average speed of your car?Time Mile marker3:00 pm 208:00 pm 241Express 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.Part BNow consider the following reaction and data:H2+2ICl→2HCl+I2Time(s) I2 concentration(M)5 1.1115 1.83What is the average rate of formation of I2?Express your answer to three decimal places and include the appropriate units.Part CBased 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.

Answer 1

Answer:

Part A: 47.8 mi/h

Part B: 0.072 M/s

Part C: 0.144 M/s

Explanation:

Part A

The average speed or velocity (V) is the variation of the space divided by the variation of the time:

V = (241 - 2)/(8 -3)

V = 47.8 mi/h

Part B

As Part A, the average rate (r) of formation of I2 is the variation of the concentration divided by the variation of time:

r = (1.83 - 1.11)/(15 - 5)

r = 0.072 M/s

Part C

The rates of the substances are proportional of their number of moles (n) which are their coefficient, so:

rI2/nI2 = rHCl/nHCl

0.072/1 = rHCl/2

rHCl = 2*0.072

rHCl = 0.144 M/s