___ Fe + ___ O2 → ___ Fe2O3 How many moles of O2 are needed to react with 3.01 x 1023 iron atoms? Please show all work.

___ Fe + ___ O2 → ___ Fe2O3
How many moles of O2 are needed to react with 3.01 x 1023 iron atoms? Please show all work.

Top of Form

Answer

• Answer = 0.375 moles
  Explanation:
  We begin by balancing the equation
  4 Fe + 3 O2 → 2 Fe2O3
  Then, 3.01 x 1023 iron atoms are equivalent to how many moles
  6.022×1023 atoms = 1 mole
  3.01 x 1023 atoms = ?
  3.01 x 1023 * 1 / 6.022×1023  = 0.5 moles
  4 Fe + 3 O2 → 2 Fe2O3
  Mole ratio
  4 moles of Fe reacts with 3 moles of O2
  0.5 moles of Fe will react with = ? O2 moles
  0.5 moles * 3 / 4 = 0.375 moles
  Number of oxygen moles that will react is 0.375 moles