Question

Help!! Giving Medal!!

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

Answer 1

you have to calculate the molecular mass of Al2O3 (or formula mass:the sum of the atomic weights of the atoms in the empirical formula of the compound.) and divide the mass in g by the molecular mass to calculate the number of moles

n = mass/molecular mass

Answer 2

Molecular mass of Al 2O3=118
so, no. of moles= 47.51/118=0.403

Answer 3

For the molar mass of Al2O3 i got 102