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Which Substance Has a Standard Enthalpy of Formation Equal to Zero

Question 3

Multiple Choice

Which substance has a standard enthalpy of formation equal to zero at 25°C?

A) C₂H₆(g)
B) Br₂(g)
C) Br₂(l)
D) Br₂(s)
E) C₂H₆(l)

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