i don't know where to post this, but we did a little experiment on pennies, and i'm having trouble with analyzing the calculations...(adsbygoogle = window.adsbygoogle || []).push({});

basically the pennies turned into silver, the other gold.. after we heat it, etc

inc. in mass of the pennies .0006 g

density of the solid added to the coins = 7.65 g/cc

atomic mass of the solid added to the coins = 32.8 g/mol

diameter of ea coin = 2.12 cm

thickness of ea coin = 1.59 mm

assume coins are circular discs & atoms are tiny cubes which stack one on top of ea other. calculate the average number of laters of atoms deposited on your coins. also calculate the thickness of this layer

surface area of ea coin, top+bottom+ side = ? sq cm

millimoles of atoms added to surface of coins = ? mmol

total surface area covered y the plated metal (area covered if one atom thick) = ? sq cm

average layers of atoms added = ?

average thickness of plated metal coating = ?

Any Help/Hints? Much appreciated.. thank you

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# Trouble w/ calculations

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