Zinc is electroplated from a ZnSO4 solution. How many grams of zinc will be deposited if a 1.6A current runs for 25 minutes?

0.817g

Explanation:

Zn2+ + 2e > An

Amount of electricity used

Q = It

= 1.6A x 25 x 60 seconds

= 2400 coulomb's

Number of moles of electrons = Q/f

F = 96500 coulomb's

= 2400/96500

= 0.025mol

From the equation above,

We see that the number of Zn moles firmed is equal to half the number of electrons used.

Molecular weight of Zn = 65.38

0.025x65.38/2

= 0.817 grams of zinc

Thank you!

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