Question

Predict the structure of the ionic compound CsBr. Draw the 3-D structure using the “reduced sphere model”. Use Cs and Br as legend to indicate the different elements in your structure. Calculate the theoretical density for Mgo. Show all your steps and draw the unit cell. | Find the degree of polymerization for polyethylene with an number average molecular weight of 500,000 g/mol.

Answer 1

mgo > Br CS CS y values Theoretical density (S) = 6.023 krome (0.624)*x (10738 odution: CoBr :- Simple cubic Crystal structure b) Theoretical density for -ngo: we Kinoco Na : Avogardo vumber - 6.023x10 mal volume of cenitcell - 23 (S = 3.519/cm3 taken from Standard radius of ng Crung) = 0.072 nm (Yo) 0.140 nm Atomic mass of my (Ang) = 26-312 9/mol. Ao 16.00 g/mol References n' (e Anyt! As) NAX Vokeine of unitcell 4X(24.312 +163 g/mol 6.023 x 10 x a² Q- lying + 270 - 260.072) +2(0.100) = 4x40.312 glmol -7 a = 0.424 nm a= 0.424 x 10 cm CS Scanned with CamScanner

2017 mgo cant cell:- ? ing 2+ • Mg O 6 02 CS Scanned with CamScanner

c) given Miss Poly Ethylene Catty 24 + 4 = 28 g/mol Taille Degree of polymerization ) = mdecubro weight Aug.m.co of mepeated SAM G anit 5,00,000 glamol lol 88 g/mol. EN 17857 CS Scanned with CamScanner