Chemical Reaction: Potassium to Potassium Oxide

How many moles of potassium oxide would be produced if you had unlimited oxygen?

Given the reaction equation: ____ K + ____ O2 → _____ K2O

Answer:

If you had unlimited oxygen, 15.6g of potassium would produce 1.2 moles of potassium oxide.

15.6g of potassium (K) would produce 1 mole of potassium oxide (K2O) assuming you had unlimited oxygen. The molar mass of potassium oxide is 94.2 g/mol. In the reaction equation K + O2 → K2O, there are 2 moles of oxygen for every 1 mole of potassium.

To calculate the moles of potassium oxide produced: 15.6g K / 39.1g K/mol = 0.4 mol K 0.4 mol K x 2 mol O2 / 1 mol K = 0.8 mol O2 0.4 mol K + 0.8 mol O2 = 1.2 mol K2O Therefore, the answer is: 15.6g K + 0.8 mol O2 → 1.2 mol K2O