Chemistry Practice Problems Hess's Law Practice Problems Solution: Calculate the ΔH° for the following reaction using...

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Solution: Calculate the ΔH° for the following reaction using the information below it. C2H5OH (l) + O2 (g) → CH3CO2H (l) + H2O (l): ΔH° = ? C2H5OH (l) + 1/2O2 (g) → CH3CHO(l) + H2O(l): ΔH° = -175 kJ CH3CHO (l) + 1/2O2 (g) → CH3CO2H (l): ΔH° = -318 kJ (A) 493 kJ (B) 247 kJ (C) 143 kJ (D) -143 kJ (E) -493 kJ

Problem

Calculate the ΔH° for the following reaction using the information below it. 

C2H5OH (l) + O2 (g) → CH3CO2H (l) + H2O (l): ΔH° = ? 

C2H5OH (l) + 1/2O2 (g) → CH3CHO(l) + H2O(l): ΔH° = -175 kJ 

CH3CHO (l) + 1/2O2 (g) → CH3CO2H (l): ΔH° = -318 kJ 

(A) 493 kJ 

(B) 247 kJ 

(C) 143 kJ 

(D) -143 kJ 

(E) -493 kJ

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