Question

1a.If Iridium (Ir) crystallises in face centered cubic unit cell. The given edge length of of the unit

cell is 383 pm. Determine the density in g/cm3. Atomic mass of Ir = 192.2 amu; 1pm = 10 -10 cm


1b. Calculate the amount of heat deposited on the skin of a person burned by 1.00 g of steam at

100 o C. ∆Hvap of water = 40.49 kJ/mol; specific heat = 4.184 J/g o C

Answer 1

1a. (383e-10)^3 =5.6181887e-23

5.6181887e-23 x 6.02e23/192.2 = 0.176153625 g/cm3.

1b. Q= 1 x 4.184 x 100 = 418.4.