AP Chemistryeasymcq1 pt
What is the standard enthalpy of formation of O₂(g)?
A.0 kJ/mol
B.−393.5 kJ/mol
C.−285.8 kJ/mol
D.It cannot be measured
Explanation
Core Concept
Elements in their standard states (the most stable form at 1 atm) are defined as zero. O₂(g) qualifies; ozone O₃ would not.
Correct Answer
A0 kJ/mol
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