Of a solution of copper sulphate 800 mg Copper is discharged at I=180mA at the cathode. (b) determines the volume of oxygen available under normal conditions (298 K, 101300 N/m2) is created at the same time. The general gas equation is p·V=n·R·T, where R= 8.314 J/molK. Note: This is the same problem with salt.