[taylor]

hey guys ive got a question ive never seen before. 
"carbon dioxide is produced in the combustion of carbon in the presence of oxygen. calculate the value of S⁰ for the oxidation of carbon as graphite to carbon dioxide: C _{(s, graphite)}+0₂ >CO₂
thanks for any help

[lancenti]

S = q/T = -dH/T

q: Heat absorbed by the surroundings
T: Temperature of the surroundings
S: Entropy Change

So you'll need dH_combustion and using that you can work out the dS for the reaction.

[taylor]

thanks for the reply but how do i work out dH? isnt there too many variables?

[lancenti]

dH is basically the enthalpy change of the reaction. You can work this out using Bond Energies, since the energy released has to be the difference in bond energies (by Conservation of Energy)