3 years ago

The number 0.000402 expressed in scientific notation is

Chemistry

1 answer:

goldfiish [28.3K]3 years ago

3 0

Answer:

hope its help you

Explanation:

4.02 x 10-4

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The standard cell potential Ec for the reduction of silver ions with elemental copper is 0.46V at 25 degrees celsius. calculate

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Solution :

The balanced cell reaction will be,

$Cu(s)+2Ag^+(aq)\rightarrow Cu^{2+}(aq)+2Ag(s)$

Here, magnesium (Cu) undergoes oxidation by loss of electrons, thus act as anode. silver (Ag) undergoes reduction by gain of electrons and thus act as cathode.

The half oxidation-reduction reaction will be :

Oxidation : $Cu\rightarrow Cu^{2+}+2e^-$

Reduction : $2Ag^++2e^-\rightarrow 2Ag$

Now we have to calculate the Gibbs free energy.

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$\Delta G^o=-nFE^o$

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Now put all the given values in this formula, we get the Gibbs free energy.

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