JEE PYQ: Electrochemistry Question 3
Question 3 - 2021 (18 Mar Shift 1)
For the reaction $2\text{Fe}^{3+}(\text{aq}) + 2\text{I}^-(\text{aq}) \rightarrow 2\text{Fe}^{2+}(\text{aq}) + \text{I}2(\text{s})$ the magnitude of the standard molar free energy change, $\Delta_rG^0_m = -$___ kJ
(Round off to the Nearest Integer).
Show Answer
Answer: 45
Solution
$E^0_{\text{cell}} = 0.233$ V. $\Delta_rG^0 = -2 \times 96.5 \times 0.233 = -45$ kJ.