Material Science question 17 Leaded glass sometimes called c

Leaded glass (sometimes called crystal) is not crystalline, but amorphous. If the simplified chemical composition by weight is 68% (SiO_2). 12% (NaO). and 15% (PbO). Calculate the molecular weight of each component molecule and the mole % PbO in this glass.

Solution

Molecular formula = 1.1333SiO₂.0.3076NaO.0.0672PbO
OR 16.84SiO₂.4.57NaO.PbO

Mole %age of PbO = 0.0445*100 = 4.45% .....Ans.

Element (Oxide)	Percentage	Molecular Weight	Mole Calculation	Mole %
SiO2	68%	28 + 32 =60	68/60 = 1.1333	1.1333/1.5081 = 0.751
NaO	12%	23 + 16 = 39	12/39= 0.3076`	0.3076/1.5081 = 0.20396
PbO	15%	207 + 16 =223	15/223 = 0.0672	0.0672/1.5081 = 0.0445