Formation Equations Video Lessons

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Problem: 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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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

ΔH˚f 0


C2H6(g) at standard conditions

not element in its standard state

ΔH˚f 0


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Problem Details

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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Based on our data, we think this problem is relevant for Professor Gray's class at OU.