Calculate the heat needed to convert 10.0 g of solid bromine from -7.2°C to 70.0°C. Bromine
has a melting point of -7.2°C and a boiling point of 58.7°C. Heat of fusion for bromine = 66.15 J/g;
heat of vaporization for bromine = 193.21 J/g; specific heat of solid bromine = 0.379 J/g°C; specific
heat of liquid bromine = 0.474 J/g°C; specific heat of gaseous bromine = 0.225 J/g°C.
A) 1021 J B) 1762 J C) 2270 J D) 2931 J E) 2960 J
Q8. If the unit cell for Mg3N2 is face-centered-cubic in nitride ions, the number of magnesium ions
per unit cell is...
A) 2 B) 4 C) 6 D) 8 E) 10
Q9. Lead (atomic radius = 175 pm) crystallizes in a face-centered cubic unit cell. Calculate the
density of lead given that in face-centered cubic, the edge length of a unit cell = r√8, where r is the
atomic radius.
A) 2.65 g/cm3 B) 6.13 g/cm3 C) 7.56 g/cm3 D) 11.3 g/cm3 E) 22.0 g/cm3