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12. (12 pts) A sphere has a radius of 1 cm. How many Cu atoms could fit into the sphere? Density of Cu 4TR3 8.93 g/em, Atomic mass of Cu 63.55 amu, Avogadros number -6.0220Volume (use back of sheet if you need more room) 13. (12 pts) In the material BeO, the Be2 and the Oions touch. The radi of the two ions are 0.054 nm and 0.132 nm, respectively. What is the Coulombic force of attraction between the two ions? (use back of sheet if you need more room) k-9*10 Vm/C, charge on one electron-0.16*10s C a2
engineering   Mechanical-Engineering   
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