A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?
1 answer:
Answer : His average speed was, 5.735 m/s
Solution : Given,
Total distance covered = 5000 meter
Total time taken = 871.7 seconds
Average speed : It is defined as the total distance covered in total amount of time.
Formula used :
Now put all the given values in this formula, we get his average speed.
Therefore, his average speed was, 5.735 m/s
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This is an incomplete question, here is a complete question and an image is attached below.
The following diagrams represent mixtures of NO(g) and O₂(g). These two substances react as follows:
It has been determined experimentally that the rate is second order in NO and first order in O₂.
Based on this fact, which of the following mixtures will have the fastest initial rate?
The mixture (1). The mixture (2). The mixture (3).
Answer : The mixture 1 has the fastest initial rate.
Explanation :
The given chemical reaction is:
The rate law expression is:
Now we have to determine the number of molecules of
In mixture 1 : There are 5 and 4
molecules.
In mixture 2 : There are 7 and 2
molecules.
In mixture 3 : There are 3 and 5
molecules.
Now we have to determine the rate law expression for mixture 1, 2 and 3.
The rate law expression for mixture 1 is:
The rate law expression for mixture 2 is:
The rate law expression for mixture 3 is:
Hence, the mixture 1 has the fastest initial rate.
