Question 259337

Calculate the change in enthalpy of the given reaction using Hess’ Law

Given the following enthalpy changes:

H2 + 1/2 O2 -> H2O ΔH= -286kJ

CO2 -> C + O2 ΔH= +394 kJ

2 CO2 + H2O -> C2H2 + 5/2 O2 ΔH= +1300 kJ

Calculate the ΔH for the following reaction:

C2H2 -> 2C + H2