Answer to Question #103858 in General Chemistry for Beverlie

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.