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Answer:
O₂(g), Br₂(l) Fe(s), He(g)
Explanation:
Those elements that occur naturally in nature are the right answers because it took nothing to make them
Delta. Hf = 0 means no heat was lost or gained
standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state is formed from its pure elements under the same conditions
O₂(g): Yes, it is a pure element in the standard state.
N(g): No, the pure element in the standard state is N₂(g).
H₂O(l): No, it is not a pure element but a compound.
Br₂(l): Yes, it is a pure element in the standard state.
Fe(s): Yes, it is a pure element in the standard state.
He(g): Yes, it is a pure element in the standard state.
S₆(s): No, the pure element in the standard state is S₈(s, rhombic).
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