D 42.2 L/mol I’s is it I got it correct
Okay I did the math and I'm guessing around 18*C
I’m pretty sure it’s D.increases the activation energy for a reaction.
Explanation:
It is known that for high concentration of
, reduction will take place. As, cathode has a positive charge and it will be placed on left hand side.
Now,
= 0 and the general reaction equation is as follows.

3.00 M n = 2 30 mM
E = 
= 
= 0.038 V
Therefore, we can conclude that voltage shown by the voltmeter is 0.038 V.
Cooper cannot be broken down into a simpler substance since it is an element meaning it had its own atoms.