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Calculate the standard emf of a cell that uses the Mg Mg2 plus and Cu Cu2 plus half cell reactions at 25 degrees C?
Cu + Mg2 --------> Cu2 + Mg
Cu --------------> Cu2 + 2e
Mg2 + 2e --------> Mg
Cu --------------> Cu2 + 2e (E = +0.35)
Mg2 + 2e --------> Mg (E = -2.36V)
+0.35 + (-2.36) = -2.01V
--------------------------------------…
Mg + Cu2 --------> Mg2 + Cu
Mg --------------> Mg2 + 2e
Cu2 + 2e --------> Cu
Mg --------------> Mg2 + 2e (E = +2.36V)
Cu2 + 2e --------> Mg (E = -0.35V)
+2.36 + (-0.35) = +2.01V
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