Answer to Question #102299 in General Chemistry for Beverlie

Question

1. What is the density of KCl at 25.00 °C if the edge length of its fcc unit cell is 628 pm? answer in g/cm3
2. Nickel crystallizes in a face-centered cubic unit cell with an edge length of 352.4 pm. Calculate the density of the metal. answer in g/mL
3. Calcium crystallizes in a face-centered cubic unit cell with an edge length of 558.84 pm. Calculate the density of the metal.answer in g/mL
4. Lead crystallizes in a face-centered cubic unit cell with an edge length of 495.08 pm. Calculate the density of the metal. answer in g/mL

Answer 1

Density Of a crystal Lattice = (Z*M) /(N*A3)

Where Z= Effective Atomic No =4 for FCC

M= Molecular Weight

N= Avogadro No. =6.023*10²³

A3=Volume of the crystal

1. Density Of KCl=1.984 g/cm3

2. Density Of Ni=8.802 g/cm3

3. Density of Ca lattice = 1.52 g/cm3

4. Density of Pb= 11.32 g/cm3