potassium chlorate, KClO3, decomposes when heated to produce potassium chloride and oxygen gas. If 2.50 grams of KCLO3 were heated in a test tube, how many grams of oxygen gas should be given off?

Question

anonymous · Answer

pleassseee help...

anonymous · Answer

First I think you need to write a balanced equation for this reaction. __KClO3 --> __KCl + __O2

anonymous · Answer

yea the balanced equation woud be 2KClO3= 2KCl+3O2

anonymous · Answer

but im stuck on what to do next

anonymous · Answer

This is a bond enthalpy problem right? ... so I think you should write it out like where you can see the bonds ... then use bonds broken and bonds formed?

anonymous · Answer

um all I know is it has to do with stoichiometry

anonymous · Answer

try this ... You're breaking 6 cl o bonds  and your forming 3 o2 bonds right? 
So try using bond enthalpy for those and do summation of bonds broken - bonds formed.

anonymous · Answer

uhhhhh i have no idea what bond enthalpy iss

anonymous · Answer

You should have learned it for this problem. What level chemistry are you in?

anonymous · Answer

10th grade honors chemistry

anonymous · Answer

Oh. Well I may be making it harder than it is for you. I'm in college level. :(

anonymous · Answer

oooh i see...well thanks for trying :)

anonymous · Answer

try to look it up in your book maybe?