Solve the following problem. Refer to the given mass numbers in computing for the molar mass.

Question

Molar numbers:

Fe= 58.85

O=16

1. If 0.95 g of Fe is used in the reaction how many moles of O2 are needed to completely react with Fe?

Answer 1

Reaction:

Fe + O₂ ==> FeO₂ (one possible reaction. There are others)

Computation:

0.95 g Fe x 1 mol Fe / 58.85 g x 1 mol O₂ / mol Fe x 32 g O₂ / mol O₂ = 0.52 g O₂ needed