Homework Help: Chemistry

Posted by Ana on Tuesday, March 2, 2010 at 9:47pm.

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

Chemistry - DrBob222, Tuesday, March 2, 2010 at 10:01pm
If you will post your work I will find your error.
Chemistry - Ana, Tuesday, March 2, 2010 at 10:09pm
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
Chemistry - DrBob222, Tuesday, March 2, 2010 at 10:46pm
See my response to your later post.

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