Question

Question 5 options: The cell potential for an electrochemical cell with a Zn, Zn2 half-cell and an Al, Al3 half-cell is _____ V. Enter your answer to the hundredths place and do not leave out a leading zero, if it is needed.

Answer 1

Answer:

The voltage is  $E_{cell} = 0.944 \ V$

Explanation:

Generally the half reaction for Zn, Zn2 half-cell is mathematically represented as

    $Zn_{(s)}$   ⇔   $Zn^{2+}_{ (aq)} + 2e^-$    (reference study academy)

and the electric potential for this is a constant value

     $E_{zn } = -0.7618 \ V$

Generally the half reaction for Al, Al3 half-cell is mathematically represented as

      $Al^{3+} _{(aq)} + 3e^-$  ⇔  $Al_{(s)}$

and the electric potential for this is constant value  

       $E_{Al } = -1.662 \ V$

Therefore the cell potential for an electrochemical cell  is mathematically represented as

          $E_{cell} = E_{zn } - E_{Al }$

substituting values

         $E_{cell} = -0.718 - (-1.662)$

        $E_{cell} = 0.944 \ V$