The following diagrams represent mixtures of NO(g) and O2(g). These two substances react as follows: 2NO(g)+O2(g)→2NO2(g) It has been determined experimentally that the rate is second order in NO and first order in O2.

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.

it is the most commonly accepted one