Answer:
Mass = 42.88 g
Explanation:
Given data:
Mass of iron = 100 g
Mass of O₂ = ?
Solution:
Chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Iron:
Number of moles = mass/molar mass
Number of moles = 100 g/ 55.85 g/mol
Number of moles = 1.79 mol
Now we will compare the moles iron with oxygen.
Fe : O₂
4 : 3
1.79 : 3/4×1.79 = 1.34 mol
Mass of oxygen used:
Mass = number of moles × molar mass
Mass = 1.34 mol × 32 g/mol
Mass = 42.88 g
