The standard enthalpy of which of the following substances is zero? (A) \( \mathrm{I}_{2}(l) \) ...

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The standard enthalpy of which of the following substances is zero?
(A) \( \mathrm{I}_{2}(l) \)
(B) \( \mathrm{H}_{2}(g) \)
(C) \( \mathrm{Br}_{2}(\mathrm{~g}) \)
(D) C(graphite).
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