Finding Avogadro\'ss number by experimenting the change in mass of copper. Trial

Question

Finding Avogadro'ss number by experimenting the change in mass of copper.

Trial 1 Trial 2 Trial 3 Initial Mass of Copper Electrode #12. SH .ToS 41 Initial Mass of Copper Electrode #2 Final Mass of Copper Electrode #1 Final Mass of Copper Electrode #2 .. o WIA /1. CIA /.'YIl Length of Experiment Min Average Current (A) 0.3 10.3. 506.329 Mass Change (Copper Electrode #1) Mass Change (Copper Electrode #2) X Analysis. Calculate the total charge, in Coulombs (C), that passed through the electrolytic cell in each trial D 509 | . O . o, 91 .6069 0.0 74 to, -18 (10 points) Trial 1 Trial 2 Trial 3 Based on the amount of charge that passed through the electrolytic cell, calculate the number of electrons removed from the copper anode in each trial. (10 points) Trial 1 Trial 2 Trial 3

Explanation / Answer

1.

Charge = Current * time

Trial 1

Q= 0.326 * 6 *60 = 205.38 C

Trial 2

Q= .325*6*60= 204.75 C

Trial 3

Q= .3244 * 6*60 = 204.372 C

2.

No of electrons = Q/1.6*10-19

Trial 1

No of electrons = 205.38/1.6*10-19

= 1.28*1021

Trial 2

No of electrons =204.75/1.6*10-19

= 1.27*1021

Trial 3

No of electrons =204.372/1.6*10-19

= 1.27*1021

3.

Moles of Cu lost in trial 1 = (2.754-2.7031)/63

=0.000807

Moles of Cu lost in trial 2 = (2.7031-2.6541)/63

=0.00077

Moles of Cu lost in trial 3 = (2.6541-2.6355)/63

=0.000295

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