The reaction that represents the standard enthalpy of formation for benzene (C₆H₆) is: A) 6 C(diamond) + 3 H₂(g) $\rarr$ C₆H₆(l) B) 6 C(graphite) + 6 H(g) $\rarr$ C₆H₆(l) C) C₆H₆(l) + 15/2 O₂(g) $\rarr$ 6 CO₂(g) + 3 H₂O(g) D) 6 C(graphite) + 3 H₂(g) $\rarr$ C₆H₆(l) E) C₆H₆(l) $\rarr$ 6 C(graphite) + 3 H₂(g)

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The standard enthalpy of formation of a compound is defined as the change in enthalpy when one mole of the compound is formed from its elements in their standard states. For benzene (C6H6), this involves the formation of benzene from graphite (the most stable form of carbon at standard conditions) and hydrogen gas. Option D correctly represents this process.

The Reaction That Represents the Standard Enthalpy of Formation for Benzene