Question

Calculate the theoretical density of Mns, given that it has the rock salt crystal structure. You may want to use the table below. The atomic weights for Mn and S are 54.94 g/mol and 32.06 g/mol, respectively. Cation Fe2+ Ni2+ Mg2+ Ionic Radius (nm) Anion Ionic Radius (nm) 0.077 0.140 0.069 S2- 0.184 0.072 0.067 Mn2+ p= g/cm3 the tolerance is +/-2%

Answer 1

First to the calculate paralle the distance sides. from the cube edges r(mn2+ ) t rcs2-) = a - 0.067 x2 + 0.184x2 = a. -> a= 0.502 mm we know Mas hic cach unit have cen. so, Fococ. unit 4 molecules. molecular mass = 87 g/mol = 14.44 x 10-23 al molecule Mass per unit cell = 4x 14.44 x 10-23. 57.76 x 10-23 I we know that, v = a3 = 0.502 = 1265X1021 Now, the oritical density = 5 = 57.76x10-23 0.1265X10-21 2 часа ales?