Of the following,ΔH°_f is not zero for ________. A)Sc (g) B)Si (s) C)P₄ (s, white) D)Br₂ (l) E)Ca (s)

Name: Of the following,ΔH° f is not zero for ________. A)Sc (g) B)Si (s) C)P 4 (s, white) D)Br 2 (l) E)Ca (s)
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The standard enthalpy of formation (ΔH°f) is zero for elements in their most stable form at 1 atm and 25°C. Scandium (Sc) in the gaseous state is not in its most stable form, which is solid, so ΔH°f is not zero for Sc (g).

Of the Following,ΔH°f Is Not Zero for ________

Of the Following,ΔH°_f Is Not Zero for ________