Do you have a volume?
10A x 10hrs x 3600 s/hr = 36,000 coulombs.
96m485 C will dissolve (or plate out) 1 equivalent weight of a metal.
1 equivalent weight of Zn = 65.38/2 = 31.3
1 equivalent weight of Cu = 63.55/2 = 31.8
Zn dissolved = 31.2 x (36,000/96,485) = ??
Cu plated = 31.8 x (36,000/96,485) = ??
?? grams of each can be converted to moles but we need a volume to convert to molarity. I don't see that in the problem.
A zinc-copper battery is constructed as follows at 25°C.
Zn|Zn^2+ (0.15 M)||Cu2+(3.00 M)|Cu
The mass of each electrode is 200. g.
a) Calculate the cell potential when this battery is first connected.
- i got this to be 1.14V
b.) Calculate the cell potential after 10.0 A of current has flowed for 10.0 h
(c) Calculate the mass of each electrode after 10.0 h.
d) How long can this battery deliver a current of 10.0 A before it goes dead?
please help! i just can't seem to figure out how to calculate the concentrations of the Zn^2+ and Cu^2+ after the current has flowed through.
-thanks.
3 answers
yes, each half-cell contains 1.00 L of solution so that is the volume
thank you!
thank you!
10A x 10hrs x 3600 s/hr = 36,000 coulombs.
You forgot to multiply by 10A...it should be 360,000 coulombs. 36,000 is seconds in 10 hours.
You forgot to multiply by 10A...it should be 360,000 coulombs. 36,000 is seconds in 10 hours.