Your reaction will produce
So, you're dealing with the decomposition of potassium chlorate into potassium chloride and oxygen gas. The balanced chemical equation for this reaction looks like this
In other words, regardless of how many moles of potassium chlorate react, you'll always have 3/2 times more moles of oxygen gas produced.
Use potassium chlorate's molar mass to determine how many moles reacted
We've established that you'll produce 3/2 times more moles of oxygen gas, which means that you'll get
Since you know moles, temperature (I"ll use
Expressed in mililiters, the answer will be
SIDE NOTE Here's how the lab setup for this reaction looks like - the oxygen gas is collected over water.