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    Exam 5: Thermochemistry: Energy Changes in Reactions
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    Which Substance Has an Enthalpy of Formation Equal to Zero
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Which Substance Has an Enthalpy of Formation Equal to Zero

Question 55

Question 55

Multiple Choice

Which substance has an enthalpy of formation equal to zero at 25oC and 1 atm?


A) N2(g)
B) N2(l)
C) N2(s)
D) N(g)
E) N(s)

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