What is E cell at 25 °C of the spontaneous cell made from the Zn 2+( aq)/Zn(s)(0.76 V)and Br 2 (l)/Br - (aq)(1.07 V)half cells if [Zn 2+ ] = 1 × 10 -2 M and [Br - ] = 1 × 10 -4 M?
A)0.40 V
B)0.13 V
C)0.61 V
D)0.01 V
E)0.49 V

Question

Quizplus · Accepted Answer

Using the formula, ES1U1B1cellS1U1B0 = ES1U1B1o - (0.0592/n) log(Q)
where ES1U1B1o = ES1U1B1red - ES1U1B1red2 
and Q = [P]/[R]
and n is the number of electrons transferred in the balanced chemical equation
For the balanced chemical equation:
Zn + BrS1U1P1-S1S1P0 → ZnS1U1P12+S1S1P0 + BrS1U1B12S1U1B0
n = 2
ES1U1B1cellS1U1B0 = (0.76 V) - (1.07 V) - (0.0592/2) log[(1 × 10S1U1P1-2S1S1P0)/(1 × 10S1U1P1-4S1S1P0)] 
ES1U1B1cellS1U1B0 = 0.61 V 
Therefore, the answer is C.

What Is Ecell at 25 °C of the Spontaneous Cell

What Is E_cellat 25 °C of the Spontaneous Cell