Question

What is the mass of 0.7891 mol of (fe2o3)?

Answer 1

Molar mass F₂O₃ = 159.69 g/mol

1 mole ------------------ 159.69 g
0.7891 moles ---------- ? g

mass = 0.7891 x 159.69 / 1

= 126.01 g 

hope this helps!