p43_012 - 12. (a) For 55 Mn the mass density is m = and for...

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12. (a) For 55 Mn the mass density is ρ m = M V = 0 . 055 kg / mol (4 π/ 3)[(1 . 2 × 10 15 m)(55) 1 / 3 ] 3 (6 . 02 × 10 23 / mol) =2 . 3 × 10 17 kg / m 3 , and for 209 Bi ρ m = M V = 0 . 209 kg / mol (4 π/ 3)[(1 . 2 × 10 15 m)(209) 1 / 3 ] 3 (6 . 02 × 10 23 / mol) =2 . 3 × 10 17 kg / m 3 . (b) For 55 Mnthechargedens ityis ρ q = Ze V = (25)(1 . 6 × 10 19 C) (4 π/ 3)[(1 . 2 × 10 15 m)(55) 1 / 3 ] 3 =1 . 0 × 10 25 C / m 3 , and for 209 Bi ρ q = Ze V = (83)(1 . 6 × 10 19 C) (4 π/ 3)[(1 . 2 × 10 15 m)(209) 1 / 3 ] 3
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