Calculate the standard cell potential at 25 ∘c for the reactionx(s)+2y+(aq)→x2+(aq)+2y(s)w here δh∘ = -829 kj and δs∘ = -367 j/k

The standard cell potential at 25 ∘C for the reaction is 2.72 Volts.

Explanation:

Δ°G = Δ°H - TΔ°S (Gibb's equation)

Δ°G =  Gibbs free energy

Δ°H = Enthalpy of the reaction at temperature T

Δ°S = Entropy of the reaction at temperature T

n = number of electrons transferred

F = Faraday's constant = 96500 C

= standard electrode potential of the cell

We have:

Δ°H = -829 kJ = -829000 J

Δ°S = -367 J/K

T = 25 C = 298.15 K

n = 2

The standard cell potential at 25 ∘C for the reaction is 2.72 Volts.

first one is the correct answer

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-