Engineering Board Exam Reviewer · Engineering Materials · hard

Copper has an FCC structure with a lattice parameter of 0.3615 nm and an atomic weight of 63.55 g/mol. What is its theoretical density?

  1. 4.47 g/cm3
  2. 2.23 g/cm3
  3. 8.94 g/cm3
  4. 6.70 g/cm3

Answer

C. 8.94 g/cm3

Solution

= nA/(Vc NA) = 4(63.55)/[(0.3615 × 10-7 cm)3(6.022 × 1023)] = 8.94 g/cm3.

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