List these compounds in order of increasing mass in grams: 2.0 mol SiCl₄, 2.0 mol PbO, 2.0 mol Fe₂O₃. Show your calculations.

a) PbO, Fe₂O₃, SiCl₄
b) SiCl₄, PbO, Fe₂O₃
c) Fe₂O₃, PbO, SiCl₄
d) Fe₂O₃, SiCl₄, PbO