Problem: Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s) ⟶2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many moles of KNO3 must be heated?

🤓 Based on our data, we think this question is relevant for Professor Zhang's class at USF.

FREE Expert Solution

So, we have the mass of oxygen gas (product) in kg and we need to find out the number of moles of KNO3 (reactant) from it.


First, let’s have a look at the data.


https://lh5.googleusercontent.com/Kho1gH3LWo6QLswPkvTzC98ftcIm7lQD4ZvDKjEm6L7Ziq3HmHF-bQ72yjkUK-MbrNdWzqqhdotR_lHoN58jPgiJDJsS5a8tH_XwGc01LyfjQBbJ2m7syvTXbb7_qx6HRN0g0cFV


We will solve this problem through these steps:

  • Convert mass of O2 from kg to g.
  • Convert mass of O2 (in g) to mol.
  • Convert moles of O2 to moles of KNO3 using a mole ratio in the above equation.


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Problem Details

Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 

4KNO3(s) ⟶2K2O(s) + 2N2(g) + 5O2(g) 

To produce 56.6 kg of oxygen, how many moles of KNO3 must be heated?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Stoichiometry concept. You can view video lessons to learn Stoichiometry. Or if you need more Stoichiometry practice, you can also practice Stoichiometry practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Zhang's class at USF.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.