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EOC_Solution_28_07 - 28.7 Solve(a Each gold atom has one...

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28.7. Solve: (a) Each gold atom has one conduction electron. Using Avogadro’s number and n as the number of moles, the number of atoms is N nN m M N V M N r L M N = = = = ( ) A A A A A A A ρ ρ π 2 The density of gold is ρ = 19,300 kg/m 3 , the atomic mass is M A = 197 g mol 1 , r = 0.5 × 10 3 m, L = 0.1 m, and N A = 6.02 × 10 23 mol 1 . Substituting these values, we get N = 4.63 × 10 21 electrons. (b) If all the electrons are transferred a charge of (4.63
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