how many moles of Cr be produced by 0.6337 moles of Cr2O3?

Answer 1

Each mole of Cr₂O₃ contains TWO moles of Cr and 3 moles of O.

So from 0.6337 moles of Cr₂O₃ you can obtain 1.267 moles of Cr

0.6337 moles Cr₂O₃ x 2 moles Cr/mole Cr₂O₃ = 1.267 moles Cr