# Chapter 12 The Solid State - Study Questions - Page 467a: 5

#### Work Step by Step

a) Copper ions: 4 inside the lattice Oxygen ions: one inside and $8\times 1/8=1$ in the vertexes, 2 in total Therefore the formula of cuprite is: $Cu_2O$. b) From the formula: $2\times x-2=0$ $x=+1$

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