Answer:
The unit cell edge length for the alloy is 0.405 nm
Explanation:
Given;
concentration of Ag,
= 78 wt%
concentration of Pd,
= 22 wt%
density of Ag = 10.49 g/cm³
density of Pd = 12.02 g/cm³
atomic weight of Ag,
= 107.87 g/mol
atomic weight of iron,
= 106.4 g/mol
Step 1: determine the average density of the alloy


Step 2: determine the average atomic weight of the alloy


Step 3: determine unit cell volume

for a FCC crystal structure, there are 4 atoms per unit cell; n = 4

Step 4: determine the unit cell edge length
Vc = a³
= 0.405 nm
Therefore, the unit cell edge length for the alloy is 0.405 nm