# Chem AP help!

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A zinc-copper battery is constructed as follows at 25°C:
Zn | Zn2+(0.15 M) || Cu2+(1.70 M) | Cu
The mass of each electrode is 150. g.
The cell potential when the cell is first attached is 1.13V

How long can this battery deliver a current of 5.00 A before it goes dead?

I tried using the method posted from a previous user, but it doesnt work!! i keep getting 24.6 hrs after using factor label. Maybe the Molarties play a part, but I don't know how...please help me!

• Chem AP help! - ,

Let's get on the same page. What Eo values are you using for Cu and Zn. Is that 1.13 v given in the problem or did you calculate that?

• Chem AP help! - ,

i've calculated it and its right (this is a webassign problem) so i know that's right...the masses were given

• Chem AP help! - ,

If I'm to help I need to know the Eo values you used. I don't want to go through this calculation using values from my book when you use values from some other book. Using my numbers I don't get 1.13 v; that's why I need the Eo values.

• Chem AP help! - ,

ok ..so the Eo value for Zn is -0.763 and for Cu its +0.337