[Violet89]

A first order reaction has an activation energy of 68.1 kJ/mol and a frequency factor (Arrhenius constant) of 1.48 x 1012 sec -1. Calculate the rate constant at 18°C.

K = Ae^(- Ea / RT)

First off, I am confused as to how to enter K = Ae^(- Ea / RT) into my calculator. So, I do it a different way. A quick tutorial on how to do so would be much appreciated though!

My work:

(-68100 / (8.314 * 291.15)) ---> 2nd + LN ---> * (1.48 * 10^12) = 0.896

The correct given answer is 0.883. Why am I slightly off? I entered in those numbers exactly. Did I do something wrong, or does that difference not matter?

I would really appreciate any help or advice!

[sjb]

A first order reaction has an activation energy of 68.1 kJ/mol and a frequency factor (Arrhenius constant) of 1.48 x 1012 sec -1. Calculate the rate constant at 18°C.

K = Ae^(- Ea / RT)

First off, I am confused as to how to enter K = Ae^(- Ea / RT) into my calculator. So, I do it a different way. A quick tutorial on how to do so would be much appreciated though!

My work:

(-68100 / (8.314 * 291.15)) ---> 2nd + LN ---> * (1.48 * 10^12) = 0.896

The correct given answer is 0.883. Why am I slightly off? I entered in those numbers exactly. Did I do something wrong, or does that difference not matter?

I would really appreciate any help or advice!

What is the temperature?

[Violet89]

A first order reaction has an activation energy of 68.1 kJ/mol and a frequency factor (Arrhenius constant) of 1.48 x 1012 sec -1. Calculate the rate constant at 18°C.

K = Ae^(- Ea / RT)

First off, I am confused as to how to enter K = Ae^(- Ea / RT) into my calculator. So, I do it a different way. A quick tutorial on how to do so would be much appreciated though!

My work:

(-68100 / (8.314 * 291.15)) ---> 2nd + LN ---> * (1.48 * 10^12) = 0.896

The correct given answer is 0.883. Why am I slightly off? I entered in those numbers exactly. Did I do something wrong, or does that difference not matter?

I would really appreciate any help or advice!

What is the temperature?

18°C ---> 291.15 K

[Borek]

I got 0.896 as well.

0.883 is what you get when you use 273 instead of 273.15 for °C -> K conversion.

[Violet89]

I got 0.896 as well.

0.883 is what you get when you use 273 instead of 273.15 for °C -> K conversion.

Thank you very much.