lazavionadams81
04.05.2020 •
Chemistry
When a comet is observed for the first time, astronomers enter information about its position, size, and motion into computer simulations in order to
A.
analyze it for animal life.
B.
measure the length of its tail.
C.
predict its orbital path.
D.
estimate its brightness.
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Ответ:
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