XClO3(s) → XCl(s) + 3/2 O2(g) The equation above represents the decomposition of a compound containi — Thermodynamics Chemistry Question

XClO₃(s) → XCl(s) + 3/2 O₂(g)

The equation above represents the decomposition of a compound containing an unknown element, X. A 1.39 g sample of XClO₃(s) was completely decomposed by heating. The gas produced by the reaction was captured over water in a gas-collection tube at 24.0°C. The total volume of gas in the tube was 506 mL, and the total pressure inside the tube was determined to be 739.5 torr. The vapor pressure of water is 22.4 torr at 24.0°C.