Find the standard enthalpy of formation of C2H5OH (l)

Question

C + O₂(g) → CO₂ ...... (i);

ΔH = -393 kJ mol^-1

H₂ + 1/2O₂ → H₂O, ...... (ii)

ΔH =  -287.3 kJ mole^-1

2CO₂ + 3H₂O → C₂H₅OH + 3O₂ ......(iii)

ΔH = 1366.8 kJ mol^-1

Find the standard enthalpy of formation of C₂H₅OH (l) 

(1)  281.1 kJ mol^-1 

(2)  -281.1 kJ mol^-1

(3)  562.2 kJ mol^-1

(4)  -562.2 kJ mol^-1

Answer 1

Correct option (2) -281.1 kJmol^-1 

Explanation:

Formation of C₂H₅OH :