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dicari ΔHd° =...?
ΔHf° = -75/0,5 = -150 KJ/mol
perjanjian : ΔHd° sama dengan ΔHf° tetapi tanda dibalik.
berarti ΔHd° = + 150 KJ/mol
rumus persamaan = CO2 => C + O2 ΔH = + 150 KJ