Question

What is standard Gibbs free energy of reaction?
What is standard gibbs free energy of rxn
$Zn(s)+C{u}^{2+}→Z{n}^{2+}+Cu(s)$
Given $E^{∘}Z{n}^{2+}/Zn=−0.74\&E^{∘}C{u}^{2+}/Cu=0.36$

• A. 300 kJ
• B. -212.3 kJ
• C. -200 kJ
• D. 515 kJ

Answer 1

Answer: (B)

$E_{\text{cell }}^o=E_{\text{red }}^o=E_{\text{oxid }}^o$
$=0.36+0.74=1.10V$
$ΔG^0=−nF{E}^{∘}$
$=−2×96500×1.10J=212.3kJ$