Question

Help! Not sure how to answer this whole question
O ELECTROCHEMISTRY Recognizing consistency among equilibrium constant, free energ... A student made measurements on some electrochemical cells and calculated three quantities: • The standard reaction free energy AG'. • 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 1. calculated quantities (Check the box next to any that are wrong.) 130. kJ/mol 1.68 x 10 o 1.35 V - 50. kJ/mol 5.75 x 1080 -0.52 V - 19. kJ/mol 0 4 .69 10+ 0 -0.20 V

Answer 1

there are 3 ways to check spontaneous:
Eo > 0
or
Go is negative
or
Kc > 1

cell A:
Go suggests reaction is non spontaneous
K suggests reaction is non spontaneous
Eo suggests reaction is spontaneous
Answer: Eo

cell B:
Go suggests reaction is spontaneous
K suggests reaction is spontaneous
Eo suggests reaction is non spontaneous
Answer: Eo

cell C:
Go suggests reaction is spontaneous
K suggests reaction is non spontaneous
Eo suggests reaction is non spontaneous
Answer: Go