Description
If mass of oxygen is 0.5 g, how much product K2O2 is formed? What is the reaction?
Explanation & Answer
Balanced Reaction is:
2K + O2 ---> K2O2
As you can see: 1 mole of O2 produces 1 mole of K2O2
Molecular weight of O2 is 32 g/mol
Molecular weight of K2O2 is 110 g/mol
First, translate mass of O2 into moles : mole O2 = 0.5 g / 32 g/mol = 0.0156 mol
Second, translate given moles into mass of K2O2 (O2 ratio to K2O2 = 1:1)
M K2O2 = o.oo92 mol x 110 g/mol = 1.72 g