Problem: Which of the following substances have a standard heat of formation (ΔHf°) of zero?i) Cl2(g) at 2 atmii) C2H6 at standard conditionsiii) O2(g) at 25.0 °Civ) 1 atm Fe at 1200 °C

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  • Recall that substances with standard heat of formation of zero are the ones in their natural state at 1 atm. 

  • Analyzing the choices:

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Problem Details

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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