HW2F19 - very easy PDF

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MSE 27-100 Fall 2019 Homework 2 Due September 16 (in class)

1.

Calculate the radius of an iridium atom, given that Ir has a FCC crystal structure, a density of 22.4 g/cm3, and an atomic weight of 192.2 g/mol. (10 points)

2.

The crystal structure of lead (Pb) is FCC. If the atomic radius of Pb is 0.175 nm, calculate the volume of its unit cell in cubic centimeters. (10 points)

3.

Calculate the theoretical density of Pb (in g/cm3). How does the theoretical value compare with the empirical value (e.g., higher/lower, percent difference)? (10 points)

4.

The atomic weight, density, and atomic radius for three hypothetical alloys are listed in the following table. For each, determine whether its crystal structure is FCC, BCC, or simple cubic and then justify your determination. (10 points) Alloy A B C

Atomic Weight (g/mol) 43.1 184.4 91.6

Density (g/cm3) 6.40 12.30 9.60

Atomic Radius (nm) 0.122 0.146 0.137...