To calculate the enthalpy change of isomerization for the conversion of n-butane to isobutane, we can use Hess's Law. According to Hess's Law, the enthalpy change of a reaction is the same whether it occurs in one step or several steps. In this case, we can consider the isomerization as a two-step process:1. Combustion of n-butane to form products CO2 and H2O 2. Formation of isobutane from the productsThe enthalpy change of isomerization H_isomerization can be calculated as follows:H_isomerization = H_combustion isobutane - H_combustion n-butane where H_combustion isobutane and H_combustion n-butane are the heats of combustion of isobutane and n-butane, respectively.Plugging in the given values:H_isomerization = -2878.8 kJ/mol - -2657.5 kJ/mol H_isomerization = -221.3 kJ/molThe enthalpy change of isomerization for the conversion of n-butane to isobutane is -221.3 kJ/mol.