How are #DeltaH_"reaction"^(@)# assessed?

1 Answer
Apr 27, 2017

Answer:

#DeltaH# is not accessed by calculation..........

Explanation:

#DeltaH_"rxn"^@# is accessed by measurement. Look in your text for #DeltaH_f^@# for #MgO#.

#DeltaH_f^@# values are extensively tabulated, and represents the enthalpy change associated with #1# #mol# of substance from its elements in their standard states at #298*K#.