Question

Calculate the enthalpy of formation of h2so4 at 298k

Answer 1

Answer:

Enthalpy of formation of h2so4 at 298k is −814.4 kJmol−1

Explanation:

In order to find the enthalpy of H2SO4 can be found out, when we know the enthalpies of its constituting elements, which is given below as

S + O2 → SO2            ΔH=−298.2kJ    

SO2+1/2O2→ SO3     ΔH=−98.7 kJ

SO3+H2O → H2SO4  ΔH=−130.2 kJ

H2+1/2O2 → H2O       ΔH=−287.3 kJ

The formation of H2SO4 i.e. H2 + S + 2O2 → H2SO4 can be calculated by adding the above four equations

ΔH=−(298.2+98.7+130.2+287.3)

     =−814.4 kJmol−1