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Carol Funk

Feb 20, 2025

Which of the following have a standard enthalpy of formation (ΔHf°) equal to zero?

Which of the following have a standard enthalpy of formation (ΔHf°) equal to zero?1) F2(g)2) Hg(l)3) NH3(g)4)C(diamond)

2 Answers

F2(g) and Hg(l) have a standard enthalpy of formation (ΔHf°) equal to zero.They are elemental and in their standard state.~~~~NH3 is not elemental and it has a nonzero enthalpy of formation. C(s, diamond) is not the standard state of carbon. Diamond has a nonzero enthalpy of formation.(Solid graphite is the standard state of carbon, and hence has a standard enthalpy of formation equal to zero.)... Show More
All elements in in standard state (298 kelvin and 1atm) have the standard enthalpy of formation equal to zero. Therefore diamond is the answer.... Show More

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