June 05, 2020, 04:09:03 PM
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### Topic: Could you tell me how to solve this equation  (Read 392 times)

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#### serjio

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##### Could you tell me how to solve this equation
« on: February 14, 2020, 02:15:35 PM »
The frequency factor is 6.31 x 108 M s-1 and the activation energy is 10 kJ/mol for the gas phase reaction: NO(g)+ O3(g)->NO2(g)+O2(g). Calculate the rate constant for this reaction at 370 K.

I try to use k= A e ^Ea/RT but it always wrong. Can anyone help me about this

#### MNIO

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##### Re: Could you tell me how to solve this equation
« Reply #1 on: February 14, 2020, 03:40:37 PM »
can you show your work?
do you have consistent units?
do you have a set of choices to pick from for answers?

#### Enthalpy

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##### Re: Could you tell me how to solve this equation
« Reply #2 on: February 16, 2020, 07:09:16 PM »
I doubt about the "+" in the exponential.

You should develop an intuition for that. Learning formulas doesn't work, you must re-establish and double-check every time whether + or -, * or /, and so on.

The activation energy slows down the reaction. So could the "+" possibly be correct?

#### MNIO

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##### Re: Could you tell me how to solve this equation
« Reply #3 on: February 16, 2020, 11:06:27 PM »
enthalpy...
I usually write the arrhenius equation as
k = Ao * exp(-Ea / RT)

regardless, I was hoping that Serjio was going to respond and show us his math with how he handled (or missed) that +/- term.  But he seems to have fled.  Too bad.

#### serjio

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##### Re: Could you tell me how to solve this equation
« Reply #4 on: February 19, 2020, 04:11:08 PM »
I doubt about the "+" in the exponential.

You should develop an intuition for that. Learning formulas doesn't work, you must re-establish and double-check every time whether + or -, * or /, and so on.

The activation energy slows down the reaction. So could the "+" possibly be correct?

agreed!!!

#### MNIO

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##### Re: Could you tell me how to solve this equation
« Reply #5 on: February 19, 2020, 11:09:16 PM »
Serjio...

you stated you tried to use the equation k = A * e^(Ea/RT) to calculate k but kept getting the wrong answer.  I asked you to show your work.  Where's the work?