AP Chemistrymediummcq1 pt
Which reaction has ΔH°_rxn equal to ΔH°_f of CO₂?
A.C(s, graphite) + O₂(g) → CO₂(g)
B.CO(g) + ½O₂(g) → CO₂(g)
C.C(diamond) + O₂(g) → CO₂(g)
D.2C(s) + 2O₂(g) → 2CO₂(g)
Explanation
Core Concept
Formation is defined as making 1 mol of compound from elements in standard states. Graphite and O₂ are the standard states, so this reaction's ΔH° is exactly ΔH°_f(CO₂).
Correct Answer
AC(s, graphite) + O₂(g) → CO₂(g)
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