I ain't asking for anyone to do this for me but i have a test tomorrow and I'm revising on the limestone cycle , extracting metals , fuels, plastics and cracking , it all involves equations such as - C + O2 -----> CO2 and i have no idea how to work them out , pleaseeeeee help me ??? and if you can , can you tell me any websites to help me revise these topics 
thankyou
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thankyou
x x x x