Instructions
For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the second decimal place; e.g. 6.25, 7.00, -0.33, -.30, 30.27, -127.30) using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer.
Question 28
For the electrochemical cell,
$$Mg(s) \mid Mg^{2+}$$ (aq,1M) $$\parallel Cu^{2+}$$ (aq,1M) $$\mid Cu(s)$$ the standard emf of the cell is 2.70 V at 300 K. When the concentration of $$Mg^{2+}$$ is changed to 𝒙 M, the cell potential changes to 2.67 V at 300 K. The value of 𝒙 is ____.
(given $$\frac{F}{R} = 11500 KV^{-1}$$, where F is the Faraday constant and 𝑅 is the gas constant, $$\ln(10) = 2.30)$$
Correct Answer: e
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