Which of the Following Substances Would Have a Standard Enthalpy

question 51

Multiple Choice

Which of the following substances would have a standard enthalpy of formation D H f equal to 0 kJ?
(Pay careful attention to the phase indicators.)
I. H₂ O ( )
II. Fe (g)
III. C (s; graphite)

• A) I only
• B) II only
• C) III only
• D) I and III
• E) II and III

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