Chemistry, 06.04.2020 14:19 charitysamuels

Standard enthalpy of formation is not zero for??
(A)O2(g). (B)Br2(l)
(C) Ba(g). (D)He(g)

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Standard enthalpy of formation is not zero for??
(A)O2(g). (B)Br2(l)
(C) Ba(g). (D)He(...