Asked by Chemistry

Which of the following has a standard enthalpy of formation value of zero at 25 degrees C and 1.0 atm

A. Fe(s)
B. Fe2O3(s)
C. FeSO4(s)
D. FeSO4(aq)
E. FeS3(s)

and what is enthalpy or how do you find it
Answered by DrBob222
All elements have a delta H<sub>f</sub> of zero at 1.0 atm and 25<sup>o<sup> C.
Answered by Chemistry
So I need to find the Hf of each of those equations
Answered by DrBob222
Absolutely not.
All ELEMENTS have a standard heat of formation of zero at 1.0 atom and 25 degrees C. Which of the 5 answers listed is an ELEMENT (the other four are, of course, compounds).
Answered by Chemistry
Fe(s) is an element right
Answered by DrBob222
yes.
Answer
Fe, all other answers are compounds so they can not have an enthalpy of 0 at 25 C.
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