Question

What is the sign of $\Delta G^{\circ }$ and the value of K an electrochemical cell for which $E_{cell}^o=0.80V$ ?

$\Delta G^{\circ }$ K

• A. ΔG = -ve
  
  k > 1
• B. ΔG = +ve
  
  k > 1
• C. ΔG = +ve
  
  k < 1
• D. ΔG = -ve
  
  k < 1

Answer 1

Answer: (A)

As $\Delta G^{\circ }=-nF{E}_{cell}^o=-0.8nF$

Hence $\Delta G^{\circ }=$ negative

$K_{eq}=antilog\left(\frac{-\Delta G^{\circ }}{2.303RT}\right)$

As $\Delta G^{\circ }$ is negative so $K_{eq}$ will be positive or > 1.