ΔH˚f = 0 for elements in their standard state (25°C and 1 atm)
Cl2(g) at 2 atm
element but not in its standard state
C2H6(g) at standard conditions
not element in its standard state
Which of the following substances have a standard heat of formation (ΔHf°) of zero? Cl2(g) at 2 atm ,C2H6(g) at standard conditions ,O2(g) at 25.0 °C and 1 atm Fe at 1200 °C
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