At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. A 0.8765-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied 57.2 mL at a temperature of 22∘C and a pressure of 734 torr. Calculate the mass percent of NaCIO3 in the original sample. (At 22∘C the vapor pressure of water is 19.8 torr.)