Quick gen chem question

[SDDDAT]

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Just took the Kaplan diagnostic from the blue book and this problem was on there.

The solution says that you have to multiply the E cell of Cobalt by 2 to balance the reaction but I thought coefficients don't change E cell values? I thought it'd be 1.82V - 0.53V = 1.29V which isn't even an answer choice.

Just want to make sure I'm not going crazy here...

 

[DAT Destroyer]

Multiplying by 2 indeed balances the equation, BUT this is NOT used to calculate the Cell Potential, . The Cell Potential is intrinsic, meaning that it does NOT depend on the amount of substance. Consult any General Chemistry text such as Change, Ebbing, Zumdahl, or Masterson for more clarity. Hope this helps.

Just took the Kaplan diagnostic from the blue book and this problem was on there.

The solution says that you have to multiply the E cell of Cobalt by 2 to balance the reaction but I thought coefficients don't change E cell values? I thought it'd be 1.82V - 0.53V = 1.29V which isn't even an answer choice.

Just want to make sure I'm not going crazy here...

Multiplying by 2 indeed balances the equation, BUT this is NOT used to calculate the Cell Potential, . The Cell Potential is intrinsic, meaning that it does NOT depend on the amount of substance. Consult any General Chemistry text such as Change, Ebbing, Zumdahl, or Masterson for more clarity. Hope this helps.

 

[mouse rat]

Seems like a mistake, my answer would have been +1.29 V