Chemistry
posted by Ana .
2KClO3 > 2KCl + 3O2
What mass of O2 can be made from heating 125 g of KClO3?
I know that the answer is 49 g O2 but I keep getting a completely different answer, can anyone show me what I'm doing wrong?
Please & Thank you

If you will post your work I will find your error.

125g KClO3 x (2 mol KClO3/ 122.49g KClO3) = 2.04 mol KClO3
2.04 mol KClO3 x (3 mol O2/1 mol KClO3) =6.12 mol O2
6.12 mol O2 x(31.98g O2/1 mol O2) = 195.71 g O2 
See my response to your later post.