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Worksheet: Calculating Gibbs Free Energies from Cell Potentials

Q1:

Using the standard electrode potentials in the table, calculate to 3 significant figures the standard free energy change at 2 5 ∘ C for the reaction:

Half-equation A g ( ) + e A g ( ) + – a q s F e ( ) + 2 e F e ( ) 2 + – a q s
Standard electrode potential, 𝐸 ⦡ (V) + 0 . 7 9 9 6 βˆ’ 0 . 4 4 7

Q2:

What is the standard free energy change for the following reaction at 2 5 ∘ C ?

Half-equation S n ( ) + 2 e S n ( ) 2 + – a q s C u ( ) + e C u ( ) 2 + – + a q a q
Standard electrode potential, 𝐸 ⦡ (V) βˆ’ 0 . 1 3 7 5 + 0 . 1 5 3