What is electrochemical cell formula?
From the electrochemical series; EOcell = EOcathode – EOanode = ECu2+| Cu = , EOZn2+| Zn = 0.34 – (-0.76) = 1.1 V. Substitute this value and we get; Ecell = 1.1 + 0.059 / 2 X log [ Cu2+ ] / [ Zn2+ ]
What is electrochemical capacity?
Capacity The theoretical capacity of a battery is the quantity of electricity involved in the electrochemical reaction Ampere – hours per gram (Ah/g).
What is the correct formula for E cell?
The overall cell potential can be calculated by using the equation E0cell=E0red−E0oxid. Step 2: Solve. Before adding the two reactions together, the number of electrons lost in the oxidation must equal the number of electrons gained in the reduction.
How do you find Delta G from E cell?
In a galvanic cell, the Gibbs free energy is related to the potential by: ΔG°cell = −nFE°cell. If E°cell > 0, then the process is spontaneous (galvanic cell).
How do you calculate electrochemical capacity?
Mw is the molecular weight of the active material used in the electrode. The Theoretical capacity is Q=277.8 mAh g-1 (considering Mw= 96.46 g/mol and n=1) The Practical capacity: Depends on the C rate used and also on the voltage range investigated (cut off voltage values).
What is mAh G?
When alloyed with lithium it has a theoretical capacity of ~3,600 milliampere hours per gram (mAh/g), which is nearly 10 times the energy density of graphite electrodes, which exhibit a maximum capacity of 372 mAh/g for their fully lithiated state of LiC6.
How do you calculate E cell for electrolysis?
Calculating e cell is easy using the E cell equation for the cathode and anode.
- MnO2(s) + H2O + e− → MnOOH(s) + OH-(aq); Eo= +0.382 V
- Zn (s)+ 2 OH -(aq) → Zn(OH)2(s) + 2e- ; Eo = +1.221 V.
How do you calculate current in chemistry?
Charge transferred
- charge, Q = current, I × time, t.
- (coulombs, C) (amperes, A) (seconds, s)
- Calculate the amount of charge transferred when a 5 A current is used for 2 minutes during electrolysis.
- 2 minutes = 2 × 60 = 120 s.
- Charge = current × time.
What is electrochemistry in chemistry?
Electrochemistry is the branch of chemistry concerned with the interrelation of electrical and chemical changes that are caused by the passage of current [3].