yatescarolanne
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Can someone please help??

I am stuck on rate equations, I know how to determine the order, but I'm stuck on calculating the rate constant for the reaction.
The initial rate is 1.2x10^4, [NO]2 which is 0.2 and [02] which is 0.3.

Also the mol^-2dm^+6s-1 makes no sense!! HELP!
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CurtisDean
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(Original post by yatescarolanne)
Can someone please help??

I am stuck on rate equations, I know how to determine the order, but I'm stuck on calculating the rate constant for the reaction.
The initial rate is 1.2x10^4, [NO]2 which is 0.2 and [02] which is 0.3.

Also the mol^-2dm^+6s-1 makes no sense!! HELP!
Okay, So, the rate equation would be this: rate = k[NO]2[O2]

You know the concentrations of the NO, and O2 - You also know what the value of the initial rate is.
You will have to rearrange the rate equation to make K the subject -
The rearranged equation would look like this -

rate
------
[NO]2[O2]


You would then substitute your known values into this equation to find out the value of k.
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yatescarolanne
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(Original post by CurtisDean)
Okay, So, the rate equation would be this: rate = k[NO]2[O2]

You know the concentrations of the NO, and O2 - You also know what the value of the initial rate is.
You will have to rearrange the rate equation to make K the subject -
The rearranged equation would look like this -

rate
------
[NO]2[O2]


You would then substitute your known values into this equation to find out the value of k.

Thank you
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CurtisDean
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(Original post by yatescarolanne)
Can someone please help??

I am stuck on rate equations, I know how to determine the order, but I'm stuck on calculating the rate constant for the reaction.
The initial rate is 1.2x10^4, [NO]2 which is 0.2 and [02] which is 0.3.

Also the mol^-2dm^+6s-1 makes no sense!! HELP!
Once you have calculated the value for K, you can work out the units for K. To to this, you simply have to use the equation that we just rearranged (where k is the subject). Instead of inputting values into the equation, we input units for each quantities instead.
For example, the units for rate = mol.dm-3s-1, the units for any concentration of a substance is usually = mol.dm-3

So if you input the units into the equation, and simplify your answer, you should get that the unit for K is mol-2.dm6s-1
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