# “1) Estimate the density of cesium iodide from its…

### Question Description:

20.50

“1) Estimate the density of cesium iodide from its crystal structure. The ionic radii of Cs+ and I are 170 and 220 pm, respectively. Cesium iodide adopts the “cesium chloride” structure. Choices below are in grams per cubic centimeters. Choice: a)7.25 b) 4.75 c) 18.9 d) 3.06 e) 0.91 f)24.5 g) 2.56 h) 1.82 i) 3.77 j)9.44 * I have asked this question before and the tutor solved the density for both CsI and CsCl and I dont know what to do with them to get the answer. Please make this clear for me. 2) The atomic radius of zinc is 137 pm. Estimate its density, given that the metal has a cubic close-packed (ccp) structure. Answers are in grams per cubic centimeters. —> When I looked this up, the density of Zinc was 7.47 however, when I calculated, I got 1.87. I do not know which one to follow. the choices are: a)14.9 b)1.87 c)59.7 d) 3.73 e)5.11 f)7.47 g)4.49 h)10.2 i)19.2 j)14.0 3) Highest boiling point: CH4, CCl4, SO3 —-> by looking at what the forces they have, I thought SO3 would have the highest BP because it has dipole force. but when I looked the actual BP up for CCl4 and SO3, CCl4 had by far higher BP than SO3. 4) 4) which is the most volatile compound? a)CI4 b)CBr2H2 c)CCl4 d) CCl3H e) CF4 f)CI2H2 g)CBr3H h) CCl2H2 i)CBr4 j)CBrH3 —-> I thought CI4 was the most volatile because it is the only one with the dispersion force. is this correct?”,Are my questions still being discussed? I’m sorry but would I be able to check on it in about an hour?