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DUMBBELLS VINYL COATED 43 PAIRS W RACK SHIPPING INC    US $899.00

RUBBER HEX DUMBBELLS 5 50LB TROY BARBELL SET SHIP INC    US $829.00

troy barbells weights from 20 110 lbs w rack    US $2,046.50

Troy Barbell 10 lbs Pro Style Rubber Dumbbells Set of 2 RUFD 010    US $293.98

Pair Vinyl Coated Dumbbells 15 lb ea FREE US SHIPPING    US $59.95

New Pair Vinyl Coated Dumbbells 12 lbs ea Magenta    US $34.95

RUBBER HEX DUMBBELLS 5 50LB SET WITH RACK SHIP INCLUD    US $1,020.00

NEW Troy VTX GTDR 3 3 Tier Dumbbell Shelf Weight Rack    US $589.00

Troy VTX Three Tier Dumbbell Shelf Rack GTDR 3    US $589.00

Troy USA Steel Hex Dumbbells weights 95 lb new Pair    US $178.22

Troy USA Steel Hex Dumbbells weights 100 lb new Pair    US $187.60

TROY VTX Aerobic Pac MDR VPAC Vinyl Dumbbells Rack    US $809.99

TROY Barbell Horizontal 3 Tier Dumbbell Rack    US $658.95

TROY Barbell VTX 12 Sided Dumbbells 15 30 Set    US $324.50

TROY Barbell VTX 12 Sided Dumbbells 35 50 Set    US $561.00

TROY Barbell VTX 12 Sided Dumbbells 5 100 Set    US $2,748.99

TROY Barbell VTX 12 Sided Dumbbells 55 100 Set    US $2,089.00

TROY Barbell VTX 12 Sided Dumbbells 5 50 Set    US $768.95

TROY Barbell VTX 12 Sided 25 lb Dumbbells    US $148.00

TROY Barbell VTX 12 Sided 30 lb Dumbbells    US $175.00

TROY Barbell VTX 12 Sided Dumbbells 3 12 Set    US $188.00

TROY Barbell VTX 12 Sided Dumbbells Pair of 35    US $182.00

TROY Barbell VTX 12 Sided Dumbbells Pair of 40    US $197.00

TROY Barbell VTX 12 Sided Dumbbells Pair of 45    US $215.00

TROY Barbell VTX 12 Sided Dumbbells Pair of 50    US $230.00

TROY Barbell VTX 12 Sided 20 lb Dumbbells    US $119.95

TROY Barbell VTX 12 Sided Dumbbells Pair of 10    US $60.50

TROY Barbell VTX 12 Sided Dumbbells Pair of 15    US $88.00

TROY Barbell VTX 12 Sided Dumbbells Pair of 5    US $38.50

Troy VTX hex style rubber dumbbells 8 sided 5 75 lb    US $1,747.20

Troy VTX PRO style dumbbell weights set 3 25 lbs new    US $216.78

Troy VTX Rubber Hex Dumbbells 20 40 lb Weights P90X    US $436.80

VTX Aerobic Pac Neoprene TROY Dumbbells MDR NPAC CAST    US $859.00

Troy USA Steel Hex Dumbbells weights 90 lb new Pair    US $168.84

Troy VTX hex style rubber dumbbells 8 sided 5 50 lb    US $800.80

Rubber Hex Dumbbells Chrome Handles 12 lbs ea FREE SHIP    US $69.95

Dumbells Troy New Rubber Coated Pair 12 sided 20 lbs    US $85.20

Dumbells Troy New Rubber Coated Pair 12 sided 125 lbs    US $532.50

Dumbells Troy New Rubber Coated Pair 12 sided 120 lbs    US $511.20

Dumbells Troy New Rubber Coated Pair 12 sided 115 lbs    US $489.90

Dumbells Troy New Rubber Coated Pair 12 sided 110 lbs    US $468.60

Dumbells Troy New Rubber Coated Pair 12 sided 105 lbs    US $447.30

Dumbells Troy New Rubber Coated Pair 12 sided 100 lbs    US $426.00

Dumbells Troy New Rubber Coated Pair 12 sided 95 lbs    US $404.70

Dumbells Troy New Rubber Coated Pair 12 sided 90 lbs    US $383.40

Dumbells Troy New Rubber Coated Pair 12 sided 85 lbs    US $362.10

Dumbells Troy New Rubber Coated Pair 12 sided 35 lbs    US $149.10

Dumbells Troy New Rubber Coated Pair 12 sided 30 lbs    US $127.80

Dumbells Troy New Rubber Coated Pair 12 sided 25 lbs    US $106.50

Dumbells Troy New Rubber Coated Pair 12 sided 15 lbs    US $63.90

Dumbells Troy New Rubber Coated Pair 12 sided 12 lbs    US $51.12

Dumbells Troy New Rubber Coated Pair 12 sided 10 lbs    US $42.60

Dumbells Troy New Rubber Coated Pair 12 sided 8 lbs    US $34.08

Dumbells Troy New Rubber Coated Pair 12 sided 5 lbs    US $21.30

Dumbells Troy New Rubber Coated Pair 12 sided 3 lbs    US $12.78

Dumbells Troy New Rubber Coated Pair 12 sided 80 lbs    US $340.80

Dumbells Troy New Rubber Coated Pair 12 sided 75 lbs    US $319.50

Dumbells Troy New Rubber Coated Pair 12 sided 70 lbs    US $298.20

Dumbells Troy New Rubber Coated Pair 12 sided 65 lbs    US $276.90

Dumbells Troy New Rubber Coated Pair 12 sided 60 lbs    US $255.60

Dumbells Troy New Rubber Coated Pair 12 sided 55 lbs    US $234.30

Dumbells Troy New Rubber Coated Pair 12 sided 50 lbs    US $213.00

Dumbells Troy New Rubber Coated Pair 12 sided 45 lbs    US $191.70

Dumbells Troy New Rubber Coated Pair 12 sided 40 lbs    US $170.40

Chemistry Gold Question?

A thin circular-disk earring 4.00 cm in diameter is plated with a coating of gold 0.25 mm thick from an Au3+ bath.

Hi Ker Herm,

I am french (Boulogne sur mer 62200 - FRANCE)

a / How many days does it take to deposit the gold on one side of one earring if the current is 0.013 A (density of Au = 19.3g/cm3)? How many days does it take to deposit the gold on both sides of a pair of earrings?
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Avogadro number : NA = 6,02•10^23 mol^-1

Charge of the electron : e = 1,6•10^-19 C

Molar mass of AU : M = 197 g/mol

density : d = 19,3 g/cm3

diameter : D = 4,00 cm

Thickness of gold : h = 0,25 mm = 0,025 cm

Volume of AU : V = π x D x h

Mass of AU : m = d x V = d x π x D x h = 19,3 x π x4,00 x 0,025 = 6,063 g

Number of moles of AU : n = m / M = 6,063 / 197 = 0,031 mol of AU

The transformation equation is :

. . . . Au(3+) . . . . + . . . . 3 e(-) . . . . -----> . . . . Au

. . . . . . . . . . . . . . . . . . . 3 mol . . . . . . . . . . . . 1 mol

. . . According to the equation :

1 mol of AU -------> 3 mol of e(-)

. . . then :

for 0,031 mol of AU -------> 3 x 0,031 = 0,092 mol of e(-)

Q = I x t

. . . then :

t = Q / I = 0,092 x 6,02•10^23 x 1,6•10^-19 / 0,013 = 681649 second

. . . t = 7 days 21 hours 20 min 49 sec for one side of one earring

. . . t = 31 days 13 hours 23 min 17 sec for a pair of earrings (4 faces !)

b / If the price of gold is $1210 per troy ounce (31.10 g), what is the total cost of the gold plating ?
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Total mass of gold = 4 x 6,063 = 24,252 g

Total cost of the gold plating : 1210 x 24,252 / 31,10 = $ 943,57

I hope to have answered your question.
.