What is the mass of 0.7891 mol of ferric oxide (fe, o3)?
a. 12.60 g
b. 126.012 g
c. 0.0126 g
d. 159.692 g
e. 1.26 g

The answer to your question is letter B.

Explanation:

Process

1.- Calculate the molecular mass of Ferric oxide

Fe = 56g x 2 = 112 g

O  = 16 x 3 = 48 g

Mass = 112 + 48 = 160 g

2.- Calculate the mass of 0.7891 moles of Ferric oxide

                                160 g of Fe₂O₃ 1 mol

                                x                         0.7891 mol

                                x =  (160 x 0.7891) / 1

                               x = 126.2 g