Final answer:
The value of ΔH∘ for the reaction is -138.4 kJ/mol.
Step-by-step explanation:
The value of ΔH∘ (in kilojoules per mole) for the reaction: CH3CH2CH3+H2→CH3CH3+CH4 can be calculated using stoichiometric calculations and enthalpy changes. By combining known enthalpy changes for individual reactions, we can determine the enthalpy change for the overall reaction.
Based on the information provided, the standard enthalpy change for this reaction is ΔH∘ = -138.4 kJ.
This result is obtained by multiplying the enthalpy change of each product and reactant by their stoichiometric coefficients, summing those values, and then subtracting the result for the reactants from the result for the products.