Practice question
Question
The standard enthalpy change for 2C(s) + 2H₂(g) → C₂H₄(g) is 52.3 kJ/mol. What is Δ Hf° of C₂H₄(g)?
Explanation
The reaction forms 1 mol of C₂H₄(g) from its elements in standard states, so Δ H = Δ Hf° (C₂H₄) = 52.3 kJ/mol, as Δ Hf° (C) = 0 and Δ Hf° (H₂) = 0.
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