Question

Calculate the standard enthalpy change (∆H°) for the formation of ammonia (NH3) at 298 K using the following data: N2(g) + 3H2(g) → 2NH3(g)  ∆H° = −92.4 kJ/mol Hint: Standard enthalpy change (∆H°) for a reaction is calculated by taking the sum of the standard enthalpies of the products minus the sum of the standard enthalpies of the reactants.

Answer 1

The given balanced chemical equation is:N2 g  + 3H2 g   2NH3 g   H = 92.4 kJ/molTo calculate the standard enthalpy change  H  for the formation of ammonia  NH3  at 298 K, we can use the given H value directly since it is already provided for the balanced equation.H = -92.4 kJ/molThis means that the standard enthalpy change for the formation of ammonia  NH3  at 298 K is -92.4 kJ/mol.