The decomposition of salicylic acid to phenol and carbon dioxide was carried out at 200.0 °C, a temperature at which the reactant and products are all gaseous. A 0.300 g sample of salicylic acid was introduced into a 50.0 mL reaction vessel, and equilibrium was established. The equilibrium mixture was rapidly cooled to condense salicylic acid and phenol as solids; the CO₂(g) was collected over mercury and its volume was measured at 20.0 °C and 730 mmHg. In two identical experiments, the volumes of CO₂(g) obtained were 48.2 and 48.5 mL, respectively. Calculate K_p for this reaction, for pressures in atmospheres.

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-ОН COOH -OH + CO2