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y Bookmarks People Window Help e Search T x CA Sign off w/ d, Berkeley × iscms/mod/lbis/view.php?id 4055647 ok 0 Presidio Trails Run- Make your own Raw ITI P Mail-T X1m Convers × Periodic × 100 Paleo Breakfas E Physical Therapy As Jur uestion 19 of 20 University Science Books presented by Sapling Leaming General Chemistry 4th Edition Given that the density of TIC(s) is 7.00 g/cm3 and that the length of an edge of a unit cell is 385 pm, determine how many formula units of TiI there are in a unit cell. Number 34 formula units Based on your answer above, how is the unit cell of TICI(s) likely to be structured? O same as CsCI(s) same as NaCKs) O neither CsCI(s) NaCI(s) Hint 'Q Previous Give Up & Vow Solution e) Check Answer Next -el E careersprivacy polc terms ofusecontactushe

Explanation / Answer

For TlCl,

given edge length (a) = 385 pm = 3.85 x 10^-8 cm

volume of unit cell = a^3 = (3.85 x 10^-8)^3 = 5.71 x 10^-23 cm^3

mass = density x volume

given density = 7.0 g/cm^3

So, mass of unit cell = 5.71 x 10^-23 cm^3 x 7.0 g/cm^3 = 4.00 x 10^-22 g

moles of TlCl = g/molar mass = 4 x 10^-22 g/239.82 g/mol = 1.67 x 10^-24 mol

number of formula units = moles TlCl x avogadro's number

                                       = 1.67 x 10^-24 x 6.023 x 10^23 = 1.00 formula units

The unit cell of TlCl is most likely to be,

same as CsCl (s)

this is primitive type cubic cell.

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