Chemistry Help Please!

Question

The rate of the reaction in terms of the "appearance of product" includes the change in the concentration of the product, the time interval, and the coefficient of the product. Consider the following reaction:

2A+3B→3C+2D

The concentrations of product C at three different time intervals are given. Use the following data to determine the rate of reaction in terms of the appearance of product C between time=0s and time=20s.

 

Time (s)      0         20           40

[C](M)     0.000   0.0240   0.0480

 

*What is the rate of reaction?*

Express your answer in molar concentration per second to three significant figures.

 

 

Answer 1

Hi Meg,

 

The rate of formation of C can be calculated from the change in [C] divided by the change in time interval.  Between 0 and 20 seconds, the rate is calculated as:

 

Rate = (0.0240 M - 0.000 M)/20 sec = 0.00120 M/sec (to three sig figs)

 

Note that the rate is positive because C is being produced, not consumed.

 

Hope this helps.