Recall that substances with standard heat of formation of zero are the ones in their natural state at 1 atm.
Analyzing the choices:
Which of the following substances have a standard heat of formation (ΔHf°) of zero?
i) Cl2(g) at 2 atm
ii) C2H6 at standard conditions
iii) O2(g) at 25.0 °C
iv) 1 atm Fe at 1200 °C
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