Suppose you are provided with a 30.86 g sample of potassium chlorate to perform this experiment. What is the mass of oxygen you expect to release upon heating?

The mass of oxygen is 12.10 g.

Explanation:

The decomposition reaction of potassium chlorate is the following:

2KClO₃(s) → 2KCl(s) + 3O₂(g)

We need to find the number of moles of KClO₃:

Where:

m: is the mass = 30.86 g

M: is the molar mass = 122.55 g/mol

Now, we can find the number of moles of O₂ knowing that the ratio between KClO₃ and O₂ is 2:3

Finally, the mass of O₂ is:

Therefore, the mass of oxygen is 12.10 g.

I hope it helps you!