Question

Calculate the standard enthalpy change for the reaction at 25°C. Standard enthalpy of formation values can be found in this list of thermodynamic properties. MgCl,(s) + H2O(1) MgO(s) + 2 HC1(e) AHA-

Answer 1

de Change Given objective is to determine the Standard enthalpy for given reaction at 25°c. reaction : Mgc145# Hole) - Moors) + 2 Hellg) Standard enthalpy vo Mgade(s) = -641-3 kg/mol Holg) = -285.8 kJmol Mgois) = -601.6 kg /mol Hellg) = -92.3 kg mol DH XL = E AH' (products) - EAH' ( Reactants) products = Mgols), Hillg) "Reactants - Mgadz (),49049) {AⓇH = [(-601-6KJ + C +92-3 42 7 -6011619 –(92.3*2) e-601.6 kg -184.6 kg OH = -786.22 kg EAH - [-6413 kg +(-285-8 kg) 7 -6413-285.8 -927• 1 kg

AHxn : -786.2 +6927.1). 2-786.2 + 927. 1 z 140.9 kg | DHIN = 140.9 kg AN