Posted by will on Friday, September 17, 2010 at 4:11pm.
I will assume you mean 24 grams of carbon burned
C + O2 --> CO2
C is about 12 grams/mol
O2 = 2*16 = 32 grams/mol
CO2 = 12+32 = 44 grams/mol therefore
24/2 = 2 mols carbon
that means 2 mols O2 and 2 mols CO2
2 mols CO2 = 88 grams --- answer
they also gave you redundant information again, check it
76.8-12.8 = 64 grams of O2 they say we used, check that
2 mols O2 = 2*32 = 64 grams, sure enough
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