Question

a sample of lead glass is prepared by melting together 20.0 g og silica (SiO2), and 80.0 g of lead oxide (PbO). what is the mole fraction of SiO2 and PbO in the glass?

Answer 1

Calculate molar mass for SiO2 and PbO

Calculate the number of moles of each material in 20.0 g of silica (SiO2), and 80.0 g of lead oxide (PbO).

number of moles = mass/molar mass

Calculate the mole fraction

mole fraction of SiO2=
number of moles of SiO2/total moles

Answer 2

0.482