A student made measurements on some electrochemical cells and calculated three q
ID: 588454 • Letter: A
Question
A student made measurements on some electrochemical cells and calculated three quantities The standard reaction free energy G The equilibrium constant K at 25.0 °C The cell potential under standard conditions E His results are listed below Unfortunately, the student may have made some mistakes. Examine his results carefully and tick the box next to the incorrect quantity in each row, if any Note: If there is a mistake in a row, only one of the three quantities listed is wrong. Also, you may assume the number of significant digits in each quantity is correct. Also note: for each cell, the number n of electrons transferred per redox reaction is 2 calculated quantities (Check the box next to any that are wrong.) cell n 26 154. kJ/mol -259. kJ/mol 259. kJ/mol 9.54 × 10 4.22 × 10 4.22 × 10 0.80 V 1.34 V 1.34 V 46Explanation / Answer
remember these:
condition 1: when delta Go is negative,
Eo is positive and K is greater than 1
condition 2: when delta Go is positive,
Eo is negative and K is less than 1
in A: see condition 2
delta Go and Eo are in sync but K is greater than 1
Answer: K is wrong
in B: see condition 1
delta Go and Eo are in sync but K is less than 1
Answer: K is wrong
in C: see condition 2
delta Go and K are in sync but Eo is positive
Answer: Eo is wrong
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