Determine the quantity of molecules of Cr₂O₃ that form when 1.34 × 10³ g of oxygen completely reacts according to the following equation:
4 Cr(s) + 3 O₂(g) → 2 Cr₂O₃(s)
a) 3.34 × 10²³ molecules
b) 6.02 × 10²³ molecules
c) 1.51 × 10²³ molecules
d) 4.02 × 10²³ molecules