Question

A scientist measures the standard enthalpy change for the following reaction to be 4.4 kJ :

Fe(s) + 2 HCl(aq)FeCl₂(s) + H₂(g)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of HCl(aq) is kJ/mol.

Answer 1

the standard enthalpy of formation of HCl(aq) is kJ/mol. $= 4.4× 2=8.8kJ/mol$