Calculate the volume of H2 gas (25 Celsius and 760 mm Hg) that will collect at the cathode when an aqueous solution of Na2SO4 is electrolytes for 90 minutes with a 12amp current.

Answer 1

Coulombs = amp x seconds = 12 x 90 x 60 = approx 65,000
2H^+ + 2e ==> H2
96,500 coulombs will release 1/2 mol H2.
Now PV = nRT =? You have P = 1 atmosphere.
V = ?
n = 1/2
R you know
T in kelvin.
Solve for V in liters.
Post your work if you get stuck.

Answer 2

Wouldn't I need to divide by 2 mol e^- to convert to moles of H^+?

Answer 3

Hey ryan thats what I did but I thought it was right? I'll show you tomorrow in lab.

Answer 4

Student