Question

KClO₃ → Kelt Oz

1. Potassium chlorate is decomposed to form potassium chloride and oxygen gas. How many
moles of potassium chlorate are needed to produce 7.8 moles of oxygen?

Answer 1

5.2 moles of KClO₃ are needed

Step-by-step explanation:

Given data:

Number of moles of potassium chlorate needed = ?

Number of moles of O₂ formed = 7.8 mol

Solution:

Chemical equation:

2KClO₃ → 2KCl + 3O₂

now we will compare the moles of KClO₃ and O₂.

O₂ : KClO₃

3 : 2

7.8 : 2/3×7.8 = 5.2

5.2 moles of KClO₃ are needed.