Alkali Halides Commonly Have Either the Sodium Chloride Structure or the Cesium

Multiple Choice

Alkali halides commonly have either the sodium chloride structure or the cesium chloride structure. The molar mass of CsCl is 2.88 times the molar mass of NaCl, and the edge length of the unit cell for NaCl is 1.37 times the edge length of the CsCl unit cell. Determine the ratio of the density of CsCl to the density of NaCl.

A) 0.541
B) 0.984
C) 1.85
D) 1.02
E) 2.10