Answer to Question #69848 in General Chemistry for Hannah

Question

The decomposition of crystalline N2O5 [N2O5(s)-->2NO2(g) + 1/2O2(g)] is an example of a reaction that is thermodynamically favored even though it absorbs heat. At 25C we have the following values for the standard state enthalpy and free energy changes of the reaction: dH=+109.6kJ/mol , dG= -30.5kJ/mol.
I have successfully calculated dS, but cannot calculate dU.
The answers provided by the book are dS=+470kJ/mol and dU=103.4kJ/mol
Thank you for your time.