Question

If 45.8 grams of potassium chlorate decomposes, how many grams of oxygen gas can be produced?

2 KClO3 → 2 KCl + 3 O2

I've never done a decomposition problem before :S

Answer 1

Step 1:
u r provided with the mass of potassium chlorate, so find its number of moles by dividing by its molar mass. say the no of moles of KClO3 is x.

Step 2:
2 moles of KClO3 gives 3 moles of O2
thus,
No of moles of O2= 3/2*x= say this is y.

Step 3:
y* molar mass of O2 =mass of oxygen produced!

Answer 2

Tyvm!