Answer:
4KO₂ + 2CO₂ -> 2K₂CO₃ + 3O₂
Step 1: Find the moles of O₂.
n(O₂) = mass/ Mr.
n(O₂) = 100 / 32 = 3.125 mol
Step 2: Find the ratio between KO₂ and O₂.
KO₂ : O₂
4 : 3
4/3 : 1
(4*3125)/3 : 3.125
=4.167 mol of KO₂
Thus now we know, to produce 100 g of O₂, we need 4.167mol of KO₂
Step 3: Find the mass of KO₂:
mass = mol * Mr. (KO₂)
Mass = 4.167* 71.1
Mass = 296.25 g