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Electrochemistry: Help!

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    • Thread Starter

    My 1st year undergrad chemistry exam is next week. I thought I was fine with electrochemistry but I tried a bunch of questions and got every single one of them wrong! What's more, I've entered the numbers into the equations in every single combination I can think of and I STILL cannot get the right answers! Needless to say, I am panicking here. Here is an example of a question:

    The pH gradient across the membrane of a cell was found to be 0.91 units with the outside more acidic. The membrane potential was measured as 75 mV with the inside of the cell negative relative to the outside. Assume the temperature is 37 degrees Celsius.

    The answer is apparently -9390 J mol-1. If anyone could give me an explanation for why this is the case it would be greatly appreciated! I assume I'm getting them all wrong for similar reasons so highlighting my error would be a huge, huge help.
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