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From: wasser@mosaic.DEC (John A. Wasser)
Newsgroups: net.physics
Subject: Electron Counting...
Message-ID: <748@decwrl.DEC.COM>
Date: Mon, 27-Jan-86 14:31:18 EST
Article-I.D.: decwrl.748
Posted: Mon Jan 27 14:31:18 1986
Date-Received: Wed, 29-Jan-86 04:05:48 EST
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Organization: Digital Equipment Corporation
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> I need to know how to calculate the number electrons in
> a solid copper sphere 10cm in diameter. 

	Find the volume of the sphere (in cc) [is it 4/3 pi r^3?]
	    (104.7197cc?).
	Multiply by the density of the copper (8.93 gm/cc) to get grams 
	    (935.1469gm?).
	Divide by the atomic weight of copper (63.54) to get Moles
	    (14.71745?).
	Multiply by Avagadro's number (6.02252e23) to get the number of atoms.
	    (88.63614e23?).
	Multiply by the number of electrons per atom (29) to get electrons
	    (2570.45e23?).


	So (if I got the folmula for volume of a sphere correct) the number
	of electrons in an uncharged 10cm sphere of copper is:

			2.57045e26

	It's easy!
 
			-John A. Wasser