Engineering Materials

The electrical conductivity and the electron mobility for some
metal at room temperature are 7.2 × 107 (Ω·m)-1 and 0.0027 m2/V·s,
respectively.(a) Compute the number of free electrons per cubic meter for
this metal at room temperature. Use scientific notation
(x.xE+xx).(b) What is the number of free electrons per metal atom? Assume
a density of 8.9 g/cm3 and an atomic weight of 63.55 g/mol.