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May 26, 2015

Homework Help: chemistry stoichiometry

Posted by Julissa on Sunday, September 9, 2007 at 9:34pm.

My chem teacher gave us this problem
Twelve-gauge copper wire,like the kind commonly used in residential electrical systems, is roughly cylindrical and has a diameter of approximately .1040in. Copper's density is 8.92g/cubic cm and copper atoms have an approximate atomic radius of 135 pm.
a.Calculate the number of atoms it would take to span the thickness, that is, diameter, of one of these wires. Express this value as a number of atoms and a number of moles to atoms.
b.calculate the mass,in grams, of a 100ft piece of copper wire.
c.How many moles of copper atoms would be found in a piece of this wire that is exactly 100ft long? How many atoms?
I tried to convert pm to meters and converting .1040 and then dividing but I don't know if I did it right---Please Help me!!!!!

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